What is the length of EF in the right triangle below?
D
26
10
E
F

The answer to four decimal places, the probability is approximately 0.6481.

To find the probability that a randomly chosen student is either female or received an "A," we need to calculate the sum of the probabilities of these two events occurring individually and subtract the probability of both events occurring simultaneously.

Let's start by calculating the probability of selecting a female student. From the given information, we know that there are 29 female students out of a total of 54 students. Therefore, the probability of selecting a female student is 29/54.

Next, we need to determine the probability of selecting a student who received an "A." Looking at the table, we can see that there are a total of 8 students who received an "A" grade out of 54. Hence, the probability of selecting a student who received an "A" is 8/54.

To find the probability of both events occurring, we need to consider the intersection of the two events, which is the set of female students who also received an "A." According to the table, there are 2 female students who received an "A." Therefore, the probability of selecting a female student who received an "A" is 2/54.

Now, we can calculate the probability of selecting a female student OR a student who received an "A" by summing the individual probabilities and subtracting the probability of both events occurring simultaneously:

Probability (Female OR "A") = Probability (Female) + Probability ("A") - Probability (Female AND "A")

= 29/54 + 8/54 - 2/54

= 35/54

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The answer is:

(x - 3)(2x + 9)

Work/explanation:

Since (x-3) appears in both terms, we move it to the first place:

(x - 3)

We need to have another term; for that other term, we take what's left, and put that as our other term.

As a result, we have:

(x - 3)(2x + 9)

Hence, this is the answer.

Answer:

a.  0.00166

b. 0.00200

Overall B is correct because it has the prossibilty of getting more votes. 0.00200

Step-by-step explanation:

3x-15=x+33

or, 3x-2x=33+15

THEREFORE X=48 UNITS

THIS IS THE CORRECT QNSWER

Answer:

b. f(4) = -12

d. (f(12) - f(4))/(12 - 4) = (12 - (-12))/8 = 24/8

= 3

The fraction that, when subtracted from 5/12, yields the same result as the difference between 2/3 and 1/2, is 1/4.

To find the fraction that, when subtracted from 5/12, gives the same result as the difference between 2/3 and 1/2, we need to compute both the difference and the subtraction, and then find the fraction that represents their equality.

The difference between 2/3 and 1/2 can be found by subtracting the two fractions:

2/3 - 1/2 = (4/6) - (3/6) = 1/6

Now, let's represent the fraction we are looking for as "x." We can set up the equation:

5/12 - x = 1/6

To solve for "x," we need to isolate it on one side of the equation. We can do this by subtracting 5/12 from both sides:

-x = 1/6 - 5/12

To simplify the right side, we need a common denominator, which is 12:

-x = 2/12 - 5/12

Now we can combine the numerators:

-x = (2 - 5)/12 = -3/12 = -1/4

To solve for "x," we multiply both sides of the equation by -1:

x = 1/4

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Answer:

the width of the compass needs to be set to equal half of the radius of the circle

Answer:

OK, HERE IS YOUR ANSWER

Step-by-step explanation:

AI-generated answer

We are given a demand curve in the form of a graph, and we are asked to find the area of the triangle shown on the diagram. The formula for finding the area of a triangle is:

Area = 1/2 x base x height

In this case, the base of the triangle is the quantity in thousands of units per unit of time, and the height of the triangle is the price in dollars per unit.

The base of the triangle can be calculated as the difference between the quantities at the two endpoints of the demand curve. From the graph, we can see that the quantity at the left endpoint is 20, and the quantity at the right endpoint is 50. Therefore, the base of the triangle is:

Base = 50 - 20 = 30

The height of the triangle can be calculated as the difference between the prices at the two endpoints of the demand curve. From the graph, we can see that the price at the left endpoint is $90, and the price at the right endpoint is $70. Therefore, the height of the triangle is:

Height = 90 - 70 = 20

Now, we can use the formula to find the area of the triangle:

Area = 1/2 x base x height

Area = 1/2 x 30 x 20

Area = 300

Therefore, the area of the triangle shown on the diagram is $300. Hence, the correct answer is 300.

The area of the triangle in the demand curve diagram can be found using the formula for the area of a triangle which is 1/2 * base * height. From the points provided, we are able to calculate an area of 2450 dollars.

To answer this question, we need to understand how to calculate the area of a triangle which is represented by the equation: Area = 1/2 * base * height. From the diagram, we can find these values:

Base: The quantity 1,000s of units per unit of time which is the x-axis,

Height: Price per unit (dollars) which is the y-axis.

Assuming that the triangle's points intersect at 10 (on the y-axis) and 70 (on the x-axis) with a hypotenuse ending at 80 on the y-axis. The base would be 70 - 0 = 70, and the height would be 80 - 10 = 70.

Plugging these values into our formula, we get Area = 1/2 * 70 * 70 = 2450 dollars. So the area of the triangle is 2450 dollars.

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The probable question may be:

The diagram to the right illustrates a hypothetical demand curve representing the relationship between price (in dollars per unit) and quantity (in 1,000s of units per unit of time).

The area of the triangle shown on the diagram is $. (Enter your response as an integer.) 100 90- 80- 70-67 60 50- 40 30- 20-17 10- D 23 73 20 30 40 50 60 70 80 90 Quantity (1,000s of units per unit of time) 10 100

If ball B₂ is placed in the tank instead of B₁, the surface of the water would not be 4cm below the top of the tank. It would be lower than that, indicating that ball B₂ causes a lesser rise in the water level due to its smaller volume.

No, the surface of the water would not be 4cm below the top of the tank if ball B₂ with a radius half of B₁ was placed in the tank instead.

The water level in a tank is determined by the volume of the object submerged in it, not just the radius of the object. The volume of a sphere is directly proportional to the cube of its radius.

Let's assume the radius of ball B₁ is r. Then, the radius of ball B₂ would be (1/2) * r.

The volume of ball B₁ can be calculated as V₁ = (4/3) * π * r³.

Similarly, the volume of ball B₂ can be calculated as V₂ = (4/3) * π * (1/2 * r)³ = (1/6) * (4/3) * π * r³.

The volume of water displaced by ball B₁ would be equal to V₁, which would cause the water level to rise.

However, the volume of water displaced by ball B₂ would be equal to V₂, which is only (1/6) of V₁. This means that ball B₂ would displace less water compared to B₁, resulting in a lower rise in the water level.

Therefore, if ball B₂ is placed in the tank instead of B₁, the surface of the water would not be 4cm below the top of the tank. It would be lower than that, indicating that ball B₂ causes a lesser rise in the water level due to its smaller volume.

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Answer:

A: A^-1 = [[-2,-3,-1.5],[-2,-4,-2.5],[-1,1,-.5]]

Step-by-step explanation:

Answer:

To find the inverse of the matrix A, we will use the row reduction method. We will augment matrix A with the identity matrix I and perform row operations until A is transformed into the identity matrix. The resulting matrix on the right side will be the inverse of A.

Step-by-step explanation:

Augment the matrix A with the identity matrix I:

[ 1  0 -3 | 1  0  0 ]

[ 3  1 -4 | 0  1  0 ]

[ 4  2 -4 | 0  0  1 ]

Perform row operations to transform the left side of the augmented matrix into the identity matrix:

R2 = R2 - 3R1

R3 = R3 - 4R1

[ 1  0 -3 | 1  0  0 ]

[ 0  1  5 | -3  1  0 ]

[ 0  2  8 | -4  0  1 ]

Perform row operations to further transform the left side of the augmented matrix into the identity matrix:

R3 = R3 - 2R2

[ 1  0 -3 | 1  0  0 ]

[ 0  1  5 | -3  1  0 ]

[ 0  0 -2 | 2  -2  1 ]

Multiply the third row by -1/2 to make the pivot element of the third row equal to 1:

R3 = (-1/2) * R3

[ 1  0 -3 | 1  0  0 ]

[ 0  1  5 | -3  1  0 ]

[ 0  0  1 | -1  1  -1/2 ]

Perform row operations to further transform the left side of the augmented matrix into the identity matrix:

R1 = R1 + 3R3

R2 = R2 - 5R3

[ 1  0  0 | 2  0  3/2 ]

[ 0  1  0 | 2  -4  5/2 ]

[ 0  0  1 | -1  1  -1/2 ]

The resulting matrix on the right side of the augmented matrix is the inverse of matrix A:

[ 2  0  3/2 ]

[ 2  -4  5/2 ]

[ -1  1  -1/2 ]

Therefore, the inverse of matrix A is:

[ 2  0  3/2 ]

[ 2  -4  5/2 ]

[ -1  1  -1/2 ]

Answer:

40.6

Step-by-step explanation:

Step 1:  Convert 52% to a decimal:

Thus, 52% as a decimal is 0.52.

Step 2:  Multiply 0.52 by 78 and round to one decimal place:

Now we can multiply 0.52 by 78 and round to one decimal place to find 52% of 78:

0.52 * 78

40.56

40.6

Thus, 52% of 78 is about 40.6,

Answer:

Slope = -7

Step-by-step explanation:

Take any two points from the table:

   (39 , 36) ⇒ x₁ = 39 & y₁ = 36

    (41 , 22) ⇒ x₂ = 41 & y₂ = 22

Substitute the points in the below formula:

                    [tex]\boxed{\bf Slope = \dfrac{y_2-y_1}{x_2-x_1}}[/tex]

                                 [tex]\sf = \dfrac{22-36}{41-39}\\\\\\=\dfrac{-14}{2}\\\\=-7[/tex]

Answer:

A. x+y+z=35,000

4x+6y+12x-194,000

2y-z=0

Step-by-step explanation:

The system of equations is:

x + y + z = 35,000 (total investment is $35,000) 4x + 6y + 12z = 19,400 (the investor wants an annual return of $1940 on the three investments) y = 2z (the client wants to invest twice as much in A bonds as in B bonds)

The answer is A.

The first equation represents the total amount of money invested in the three types of bonds. The second equation represents the total annual return on the investments, which is equal to the sum of the individual returns on each type of bond. The third equation represents the client's preference for investing in A bonds over B bonds.

The system of equations can be used to solve for the values of x, y, and z, which represent the amounts invested in AAA, A, and B bonds, respectively.

Answer:

[tex]\textsf{A.} \quad \begin{cases}x+y+z=35000\\4x+6y+12z=194000\\2z-y=0\end{cases}[/tex]

Step-by-step explanation:

A system of equations is a set of two or more equations with the same variables. It allows us to model and solve problems that involve multiple equations and unknowns.

An investment firm recommends that a client invest in bonds rated AAA, A, and B. The definition of the variables are:

The average yield on each of the three bonds is:

We have been told that the total investment is $35,000. Therefore, the equation that represents this is the sum of the three investments equal to 35,000:

[tex]x+y+z=35000[/tex]

To find the annual return on each investment, multiply the number of bonds by the average yield (in decimal form). Given the investor wants a total annual return of $1940 on the three investments, the equation that represents this is the sum of the product of the investment amount for each bond type and its corresponding yield, equal to $1940.

[tex]0.04x+0.06y+0.12z=1940[/tex]

Multiply all terms by 100:

[tex]4x+6y+12z=194000[/tex]

Finally, given the client wants to invest twice as much in A bonds as in B bonds, the equation is:

[tex]y=2z[/tex]

Subtract y from both sides of the equation:

[tex]2z-y=0[/tex]

Therefore, the system of equations the models the given scenario is:

[tex]\begin{cases}x+y+z=35000\\4x+6y+12z=194000\\2z-y=0\end{cases}[/tex]

Given statement solution is :- The manager will have enough funds, and the amount set aside ($10,000) is sufficient to cover the payroll for the next four weeks.

To determine if the manager will have enough funds to cover the nightly payroll for the next four weeks, we need to calculate the total cost for four weeks and compare it to the amount set aside.

The nightly payroll has a mean of $2200 and a standard deviation of $300. Since there are seven nights in a week, the weekly payroll can be calculated as:

Weekly Payroll = Nightly Payroll * Number of Nights in a Week

= $2200 * 7

= $15,400

To calculate the total cost for four weeks, we multiply the weekly payroll by four:

Total Cost for Four Weeks = Weekly Payroll * Number of Weeks

= $15,400 * 4

= $61,600

Now, let's calculate the z-score using the formula:

z = (X - μ) / σ

Where:

X = Total Cost for Four Weeks

μ = Mean of the distribution

σ = Standard deviation of the distribution

z = ($61,600 - $2200) / $300

z = $59,400 / $300

z ≈ 198

To determine if the manager will have enough funds to cover the payroll, we need to find the proportion of the distribution that is less than or equal to the z-score. This can be done by consulting a standard normal distribution table or using statistical software.

For a z-score of 198, the proportion in the tail of the distribution is essentially 1 (or 100%). This means that the manager is virtually guaranteed to have enough funds to cover the payroll for the next four weeks.

Since the manager has set aside $10,000, which is less than the calculated total cost of $61,600, he will indeed have enough funds to cover the payroll.

Therefore, the manager will have enough funds, and the amount set aside ($10,000) is sufficient to cover the payroll for the next four weeks.

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The graph of the piecewise-defined function will consist of two horizontal line segments.

The piecewise-defined function can be represented using a graph with two separate segments.

First, let's consider the segment where the value of y is 6 when x is less than -3. This means that for any x-value less than -3, the corresponding y-value is 6. This segment will be a horizontal line parallel to the x-axis, located at the y-coordinate of 6.

Next, let's consider the segment where the value of y is 3 when x is greater than or equal to -3 and less than or equal to 2. This means that for any x-value between -3 and 2 (inclusive), the corresponding y-value is 3. This segment will also be a horizontal line parallel to the x-axis, located at the y-coordinate of 3.

To summarize:

For x < -3, y = 6.

For -3 ≤ x ≤ 2, y = 3.

Therefore, Two horizontal line segments make up the graph of the piecewise-defined function. One segment will be located at y = 6, and the other segment will be located at y = 3. The vertical range of the graph will extend to include both y-values (6 and 3), while the horizontal range will depend on the given x-values and the interval specified.

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Answer:

[tex]\Huge \boxed{\boxed{\bf{Volume = 848.23 cm^3}}}[/tex]

Step-by-step explanation:

To calculate the volume of a cone with a height of 10 cm and a diameter of 18 cm, we can use the formula:

[tex]\LARGE \boxed{\tt{V = \frac{1}{3} \times \pi \times r^2 \times h}}[/tex]

➤V = volume

➤r = radius

➤h = height

Since the diameter is 18 cm, the radius is half of that, which is 9 cm. Now, we can plug in the values:

The volume of the cone is [tex]\tt{270\pi \approx 848.23 \texttt{ cm}^3}[/tex]

__________________________________________________________

The value of the algebraic expression is ab+bc+ca.

An algebraic equation is a mathematical statement that contains two equated algebraic expressions formulated by applying algebraic operations such as addition, subtraction, multiplication, division, raising to a power, and extraction of a root to a set of variables

The equation A^3(b+c)/(a-b)(a-c) + b^3(c+a)/(b-c)(b-a) + a^3(a+b)/(c-a)(c-b) = ab+bc+ca

(a-b, a-c, b-c, b-a, c-a, c-b).

Simplifying each fraction, we get

(a^3b + a^3c)/(a^2 - ab - ac + b^2 - bc + c^2) + (b^3c + b^3a)/(b^2 - bc - ba + c^2 - ac + a^2) + (a^4 + a^3b)/(c^2 - ac - ab + b^2 - bc + a^2).

(a-b)(a-c), (b-c)(b-a), and (c-a)(c-b),

ab+bc+ca.

Therefore, the equation A^3(b+c)/(a-b)(a-c) + b^3(c+a)/(b-c)(b-a) + a^3(a+b)/(c-a)(c-b) = ab+bc+ca

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Calculating bi-weekly pay involves determining the total earnings for a two-week period. Here's the process 1. Determine the hourly rate: Start by determining the hourly rate of pay. For example, let's say the hourly rate is $15.

2. Calculate regular earnings: Determine the number of hours worked in a two-week period. Let's assume 80 hours. Multiply the hourly rate by the number of hours worked to calculate the regular earnings: $15/hour x 80 hours = $1200.

3. Calculate overtime (if applicable): If there are any overtime hours, calculate the overtime earnings separately. Typically, overtime is paid at a higher rate (e.g., 1.5 times the regular hourly rate) for hours worked beyond a certain threshold (e.g., 40 hours per week). Multiply the overtime hours by the overtime rate and add this amount to the regular earnings.

4. Deduct taxes and other withholdings: Subtract the applicable taxes and other withholdings from the total earnings. This may include federal income tax, state income tax, Social Security tax, Medicare tax, and any other deductions.

5. Determine the net pay: Subtract the deductions from the total earnings to calculate the net pay—the amount the employee takes home after taxes and withholdings.

It's important to note that bi-weekly pay may also include additional components such as bonuses, commissions, or other allowances. These should be factored into the calculations accordingly.

By following these steps, you can calculate an employee's bi-weekly pay based on their hourly rate, hours worked, and any additional components or deductions involved.

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Answer: -6

Step-by-step explanation:

1. Evaluate the expressions inside the innermost brackets and braces first:

 [tex]\((-2)^2 \cdot 2 - 6 = 4 \cdot 2 - 6 = 8 - 6 = 2\)[/tex]

  So, the expression becomes:

  [tex]\(14 - \{7 + 4 \cdot 3 - 2\}+ (2^2 + 6 - 5 \cdot 3) + 3 - (5 - 2^3 / 2)\)[/tex]

2. Continue evaluating the expressions inside the braces:

  [tex]\(7 + 4 \cdot 3 - 2 = 7 + 12 - 2 = 17\)[/tex]

  So, the expression becomes:

[tex]\(14 - 17 + (2^2 + 6 - 5 \cdot 3) + 3 - (5 - 2^3 / 2)\)[/tex]

3. Now, evaluate the expressions inside the parentheses:

[tex]\(2^2 + 6 - 5 \cdot 3 = 4 + 6 - 15 = -5\)[/tex]

 [tex]\(5 - 2^3 / 2 = 5 - 8 / 2 = 5 - 4 = 1\)[/tex]

  So, the expression becomes:

[tex]\(14 - 17 - 5 + 3 - 1\)[/tex]

4. Finally, perform the remaining operations:

[tex]\(14 - 17 - 5 + 3 - 1 = -3 - 5 + 3 - 1 = -6\)[/tex]

So, the result of the expression is -6.

a. The marginal profit function Py is Py = -30x + 47y - 915 and

b. Change in profit if price increase by 1 cent is 831 cents.

To find the marginal profit functions Px and Py, we need to find the partial derivatives of the profit function P(x, y) with respect to x and y, respectively.

Given:

P(x, y) = (x - 40)(55 - 4x + 5y) + (y - 45)(70 + 5x - 7y)

a. Marginal profit function Px:

To find Px, we differentiate P(x, y) with respect to x while treating y as a constant:

Px = ∂P/∂x = (∂/∂x) [(x - 40)(55 - 4x + 5y) + (y - 45)(70 + 5x - 7y)]

Expanding the terms and simplifying:

Px = (55 - 4x + 5y) + (x - 40)(-4) + (70 + 5x - 7y)(5)

Simplifying further:

Px = 55 - 4x + 5y - 4x + 40 + 350 + 5x - 7y

Combining like terms:

Px = 355 - 3x - 2y

b. Marginal profit function Py:

Similarly, to find Py, we differentiate P(x, y) with respect to y while treating x as a constant:

Py = ∂P/∂y = (∂/∂y) [(x - 40)(55 - 4x + 5y) + (y - 45)(70 + 5x - 7y)]

Expanding the terms and simplifying:

Py = (x - 40)(5) + (70 + 5x - 7y)(-7) + (y - 45)(5)

Simplifying further:

Py = 5x - 200 - 7y - 490 - 35x + 49y + 5y - 225

Combining like terms:

Py = -30x + 47y - 915

This is the profit function Py.

b. Estimating the daily change in profit:

To estimate the daily change in profit, we need to evaluate Px and Py at the given prices and calculate the change in profit when the prices are increased as specified.

Given initial prices:

First brand price (x) = 70 cents

Second brand price (y) = 73 cents

To estimate the change in profit, we substitute the initial prices into Px and Py and calculate the results:

Px(70, 73) = 355 - 3(70) - 2(73)

          = 355 - 210 - 146

          = -1

Py(70, 73) = -30(70) + 47(73) - 915

          = -2100 + 3431 - 915

          = 416

The daily change in profit can be estimated by multiplying the changes in price (1 cent for the first brand and 2 cents for the second brand) with the respective marginal profit functions:

Change in profit = ΔP ≈ Px(70, 73) * 1 + Py(70, 73) * 2

               ≈ -1 * 1 + 416 * 2

               ≈ -1 + 832

               ≈ 831 cents

Therefore, the estimated daily change in profit when the salesperson increases the price of the first label by 1 cent and the price of the second label by 2 cents is 831 cents.

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The standard form of the polynomial x^2 - x^6 + x^8 - 5 is:

x^8 - x^6 + x^2 - 5

To express the polynomial x^2 - x^6 + x^8 - 5 in standard form, we arrange the terms in descending order of their exponents.

The given polynomial can be rewritten as:

x^8 - x^6 + x^2 - 5

In the standard form of a polynomial, the terms are arranged in descending order of their exponents. So, let's rearrange the terms:

x^8 - x^6 + x^2 - 5

The standard form of the polynomial x^2 - x^6 + x^8 - 5 is:

x^8 - x^6 + x^2 - 5

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The value of x that satisfies the equation x² + x - 6 = 0 is x = 2 or x = -3.

To find the value of x that satisfies the equation x² + x - 6 = 0, we can solve the quadratic equation by factoring or using the quadratic formula.

Option 1: Factoring

To factor the quadratic equation, we need to find two numbers whose product is -6 and whose sum is +1 (the coefficient of x).

The numbers that satisfy this condition are +3 and -2.

Therefore, we can rewrite the equation as (x + 3)(x - 2) = 0.

Setting each factor equal to zero, we have x + 3 = 0 or x - 2 = 0.

Solving these equations gives x = -3 or x = 2.

Option 2: Quadratic Formula

The quadratic formula states that for an equation of the form ax² + bx + c = 0, the solutions for x are given by:

x = (-b ± √(b² - 4ac)) / (2a).

In our equation, a = 1, b = 1, and c = -6.

Substituting these values into the formula, we have:

x = (-1 ± √(1² - 4(1)(-6))) / (2(1)).

Simplifying the expression inside the square root, we get:

x = (-1 ± √(1 + 24)) / 2.

x = (-1 ± √25) / 2.

x = (-1 ± 5) / 2.

This gives us two solutions: x = (-1 + 5) / 2 = 4 / 2 = 2, and x = (-1 - 5) / 2 = -6 / 2 = -3.

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Answer:

2 4 8 16 and so on and so forth

Answer:

30.7

Step-by-step explanation:

30.725 to one decimal place is 30.7.  To round/correct to one decimal place, it would be the tenths.  So, look at the hundredths place number (2), and if its greater than 5, add 1 to the tenths place (7 changes to 8), and if its less than 5, don't do anything (7 stays as 7).

Hope this helps! :)

Answer:

The value corrected to one decimal place is 30.7

Step-by-step explanation:

The value 30.725 has three decimal places. The number 7 is in the one's place, the number 2 is in the tenth place, and the number 5 is in the hundredth place.

To round off, if the value in a place is equal to or above 5, the previous place number is increased by one; else it remains the same. In this case, the hundredth place is 5, so we add 1 to the tenth place. This gives us 2 + 1 = 3. Therefore, the number is expressed with two decimal places as 30.73.

To express it as one decimal place, we look at the value in the tenth place, which is 3. As 3 is less than 5, the one's place remains the same.

Thus, the value is 30.7 when expressed with one decimal place.

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Answer:

B

Step-by-step explanation:

The graph which shows the interval notation of the inequality 3 > - x > - 7 is option C.

3 > - x > - 7

Break the compound inequality into two and solve each

3 > - x

divide both sides by -1

-3 < x

- x > - 7

divide both sides by -1

x < 7

So the solution to the inequality is

-3 < x < 7

Therefore, it can be interpreted that x is greater than -3 and less than 7

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Answer:

17.85$

Step-by-step explanation:

Let x be 1 shirt price

Let y be 1 pant price

we have the following equation

3x+2y = 104.81$ (1)

2x+y = 61.33$ => multiply two sides by 2 => 4x + 2y = 122.66 (2)

=> (2) - (1) => x = 17.85$

So one shirt is 17.85$

Answer:

PQ=20

Step-by-step explanation:

1) 11+x+2+3x-1+10+2x=64

2) 6x+22=64

3) 6x=42

4) x=7

5) PQ = 3(7)-1 = 20

Answer:

b = 10

Step-by-step explanation:

expand expression and compare like terms.

(r + a)(r - 15) ← expand using FOIL

= r² - 15r + ar - 15a ← factor out r from second/ third terms

= r² + r(a - 15) - 15a

compare with r² - br - 75

then

- 15a = - 75 ( divide both sides by - 15 )

a = 5

and

a - 15 = - b ← substitute a = 5

5 - 15 = - b

- 10 = - b ( multiply both sides by - 1 )

10 = b