ASAP!!!!!
Analysis: For the given system, tell which equation you would first use to solve for a variable in the first step
of the substitution method. Explain your choice.
2.5x – 7y = 7.5
6.2 - y = 1

Answers

Answer 1
When using substitution, you want to solve an equation for one variable that doesn’t make the equation worse to work with.

The general idea is that you want to find a variable that has a coefficient of 1 or -1.

In 2.5x - 7y = 7.5, both variables have “bad” coefficients.

In 6.2x - y = 1, the y has a coefficient of -1. That’s where you want to start.

Related Questions

A new car worth $28,000 is depreciating in value by $2000 per year. Write a formula that models the car's value, y, in dollars, after x years.

Answers

Answer: 28,000-2,000x= y

Step-by-step explanation: 28,000 is the starting cost. You would have to then multiply 2,000 by the amount of years it depreciates you find the total amount of value lost during the depreciation period. Once the total depreciation is determined you would subtract the starting cost from the depreciation amount. Determining Y, the value of the car after a certain amount of years.

Given that a new car worth $28,000 is depreciating in value by $2000 per year. The linear equation that models the car's value, y, in dollars, after x years : y = 28000 - 2000x.

What is linear equation?

A linear equation is an equation in which the highest power of the variable is always 1. It is also known as a one-degree equation.

Present car's value = y dollars

Number of years passed = x years

Linear equation that models the car's value =

y = 28000 - 2000x

($2000 depreciates every year. So the current value of the car is original price minus the $2000 subtracted every year i.e., x times $2000)

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0ne elven and ninty ten thousandths. How would you write this

Answers

Answer:

one elven? do you mean eleven? if so, the answer is 11.00900 hope this helps

Step-by-step explanation:

Answer:

11.091000

Step-by-step explanation:

plz help with this!!!

Answers

Answer:

an exact location in space.

Step-by-step explanation:

P.S. please take a better picture because there is a reflection from the light and it makes it hard to read

what is the answer to: 6m+7n+5m−3n?

Answers

Step-by-step explanation:

6m+7n+5m-3n

11m+7n-3n

11m+4n

Que procedimiento tendrías que seguir para determinar el tamaño de los escalones

Answers

El tamaño del paso se puede determinar mediante progresión aritmética.

La secuencia aritmética implica una serie de números enumerados de manera que los números sigan un patrón específico y definido.

Para determinar el tamaño del paso, usamos lógica aritmética de prorrateo.

Del formulario de progresión aritmética, donde:

[tex] a_{n} \: = a \: + \: (n - 1)d[/tex]

n = número de términos (número de pasos) = 9

d = diferencia común (tamaño de los pasos)

[tex] a_{n}[/tex]

Valor del enésimo término = 2

a = primer término = 1

Usando los parámetros, podemos obtener el valor de d que es el tamaño de cada paso.

Ingresando los valores en la fórmula:

2 = 1 + (9 - 1) d

2 = 1 + 8d

2 - 1 = 8d

1 = 8d

d = 1/8

d = 0,125

Por tanto, el tamaño del paso es de 0,125 metros.

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I don’t know this answer please help

Answers

Answer:

3:2

plsss mark me brainliestt

Step-by-step explanation:

25 games played

15 won

10 lost

15:10

3:2

Find the length indicated.

Answers

Answer:

The length of [tex]BC[/tex] is [tex]3[/tex] units.

Step-by-step explanation:

The points [tex]A,B,C[/tex] are collinear and [tex]B[/tex] is in middle of [tex]A,C[/tex], so the expression that can justify the given statement is,

[tex]AB+BC=AC[/tex]

The given values are,

[tex]\begin{aligned}AB&=10\\AC&=13\end{aligned}[/tex]

Substituting values in the expression, it becomes,

[tex]\begin{aligned}AB+BC&=AC\\10+BC&=13\\BC&=13-10\\BC&=3\end{aligned}[/tex]

Help me with this please :'-)

Answers

hiii how are you feeling today

Evaluate the expression when c=21 and d=4.
c-5d

Answers

[tex] \huge \boxed{\mathfrak{Question} \downarrow}[/tex]

Evaluate the expression when c = 21 and d = 4, c - 5d = ?

[tex] \large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}[/tex]

Given,

c = 21d = 4c - 5d = ?

Let's solve it now :-

[tex] \sf \: c - 5d \\ \\ \sf \: Substitute \: the \: values \: of \: c \: and \: d \\ \\ \sf c - 5d \\ \rightarrow \sf(21) - 5(4) \\ \sf \rightarrow21 - 20 \\ = \boxed{\boxed{\bf \: 1}}[/tex]

The value of the expression is 1.

The product of a number and 3 is 5 less than the quotient of a number and 2.

Answers

9514 1404 393

Answer:

  -2

Step-by-step explanation:

Let the number be represented by x.

  3x = (x/2) -5

Multiplying by 2 gives ...

  6x = x -10

  5x = -10 . . . . . . subtract x

  x = -2 . . . . . . . . divide by 5

The number is -2.

Mike pays $20 per hour for algebra tutoring. The equation y = 20x relates the cost of tutoring (y) to the number of hours (x) he is tutored. Identify the unit rate in the equation.

Answers

Answer:

The unit rate is $20 per hour?

Step-by-step explanation:

For every hour Mike is tutored, he pays $20. 20:1

If Mike payed $20 every two hours, then the unit rate would be $10 per hour.

chi tiền mặt tạm ứng cho nhân viên mua hàng 10.000.000đ

Answers

Answer:

Please write in english

If log(x + y) = log 3 + ½log x + ½log y, prove that x² + y² = 7xy​

Answers

Please find attached photograph for your answer.

Incorrect
Your answer Is Incorrect.
In the figure below, O is between M and P, and N is the midpoint of MO. If NO=2 and NP=6, find MP.
M
N
P
MP =

Answers

Answer:

m is the right answer

Step-by-step explanation:

no step hope yu mark me as brainliest

PLS HELP i will mark brainliest

Give an example of the product of a rational number and an irrational number and explain whether the answer would result in a rational or irrational number. MATH

Answers

Answer:

Step-by-step explanation:

there doesn't exist an example of Rational and Irrational Numbers whose product is Rational, except when an Irrational Number is multiplied by 0, which results in 0, a Rational Number.

What is the product of 7 x 106?

Answers

The product of 7 x106=742

QUESTION 2:
The perimeter of a square P (measured in centimeters) is expanding in size at a constant rate of change of
4 centimeters per centimer with respect to the square's side length s (measured in centimeters).
a) If the length of the side of the square changes from
1. Oto 1.5 centimeters, how does the square's perimeter P change?
2. 3 to 8 centimeters, how does the square's perimeter P change?
b) Express the change in the square's perimeter p in terms of the change in the square's side length s.
AP=
Write a formula and construct a graph that represents the perimeter of the square P (in centimeters)
in terms of the square's side lengths (in centimeters).
x
d) Illustrate the solution to 8 - 4.s on the graph below and describe what this solution represents.
e) P-4.s represents the square's perimeter in terms of the square's side length (in centimeters).
write a formula that represents the perimeter's side lengths in terms of the square's perimeter P.
f) How is the formula you determined in part (e) related to the formula P=4.s?

Answers

We know that for a square of side length s, the perimeter is given by:

P(s) = 4*s

a) If initially we have s = 1cm, then the initial perimeter is:

P(1cm) = 4*1cm = 4cm

if now s changes to 1.5cm, the new perimeter will be:

p(1.5cm) = 4*1.5cm = 6cm

So the side length increased 0.5cm, and the perimeter increased 4 times that, 2cm.

b) We can define the change in side length as Δs, then if the initial side length is s, the new side length will be written as:

s + Δs

using this in the perimeter equation we get:

P(s + Δs) = 4*(s + Δs) = 4*s + 4*Δs = P(s) + ΔP

We can see that ΔP = 4*Δs

c) We already know the formula, it is P(s) = 4*s, the graph can be seen below.

d) We need to solve 8 = 4*s

To get this, we need to isolate s.

s = 8/4 = 2

s = 2

This means that if the perimeter is 8cm, then the side length must be 2cm

e) P = 4*s

is the perimeter in terms of the side length, we want to get the side length in terms of the perimeter, we just need to divide both sides by 4:

s = P/4

f) The formula we got in (e) is the formula P = 4*s divided on both sides by 4.

That is the relation between the two formulas.

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Mrs. Haley baked apple pies for her family. The boys ate 9/10 of a pie and the girls ate 2/5 of a pie. How much more pie did the boys eat than the girls?

Answers

Answer: The boys ate half a pie more than the girls did (5/10 more).

Step-by-step explanation:

2/5 = 4/10

The difference between 9/10 and 4/10 is 5/10, or one half, so that's your answer.

express 8% as a decimal fraction​

Answers

Hello :D

The answer is 0.08

I hope this helps :)

Please help me!!!!!!

Answers

Answer:

y = -[tex]\frac{7}{4}[/tex]x + 14

Step-by-step explanation:

if we transpose the correct answer will be y = -[tex]\frac{7}{4}[/tex]x + 14

Suppose you have a clothes dryer that uses 4000 watts of power and you run it for an average of 1 hour each day. If you pay the utility company 14¢ per kilowatt-hour of elec- tricity, what is the average daily cost to run your dryer? How much would you save in a year if you replace it with a more efficient model that uses only 2000 watts?

Answers

Step-by-step explanation:

4000 Watts means that if you run the machine for one hour, you are using 4000 watt-hours or more commonly used 4 kWh (kilo means 1000).

for 14 cents per kWh we have then

14 × 4 = 56 cents per day

now, if the other model uses only 2000 Watts and still only needs 1 hour for the same job (which is in reality NOT a given, very often such a machine means that it will have to run close to 2 hours) it would cost

14 × 2 = 28 cents per day, saving 28 cents per day.

for a year running the dryer daily

we would save

28 × 365 = 10220 cents = $102.20 savings per year

Bob has 32 chickens on his farm. On average each chicken lays 11 eggs

Answers

Answer:

352 is the answer

Step-by-step explanation:

32×11

= 352

Once again, this is gonna be a long day. Chose each set the number below belongs to (select al that apply)

5/6

real
irrational
rational
integer
whole
natural

Answers

9514 1404 393

Answer:

  real, rational

Step-by-step explanation:

The ratio of two mutually prime natural numbers is not ...

  irrational, integer, whole, natural

The ratio 5/6 is ...

  real, rational

A total of 600 tickets were sold for the school play. They were either adult tickets or student tickets. There were 50 more student tickets sold than adult tickets. How many adult tickets were sold?

Answers

Answer:

275

Step-by-step explanation:

x + x + 50 = 600

2x = 550

x = 275

60 is 1/100 of what? ​

Answers

Answer:

60% or 0.6 as a decimal

Solve the problem. Use unit analysis to check your work. You drive for 3
hours at 65 miles per hour. How far do you go?

Answers

Answer:

195

Step-by-step explanation:

65x3

factorization
x2+2xy+y2-9​

Answers

[tex]\\ \sf\longmapsto x^2+2xy+y^2-9[/tex]

[tex]\boxed{\sf (a+b)^2=a^2+b^2+2ab}[/tex]

[tex]\\ \sf\longmapsto (x+y)^2-9[/tex]

[tex]\\ \sf\longmapsto (x+y)^2-3^2[/tex]

Hope this helped!! :))

Which equation corresponds to the following word problem?
Cory spends $6.50 on snacks at a gas station. He also buys gas, which costs $2.78 per gallon. If he spends a total of $24.00 at the gas station, how many
gallons of gas did he buy? Let g equal the number of gallons of gas.
(1 point)
O 6.509 +2.78 = 24.00
O 2.789 -6.50 = 24.00
O 6.50g - 2.78 = 24.00
2.789 +6.50 = 24.00

Answers

Answer:

Cory bought 6.30 gallons of gas at the gas station.

Step-by-step explanation:

total amount = cost of snacks + amount spent on gas

[tex]$\$ 24.00=\$ 6.50+\$ 2.78 \mathrm{~g}$[/tex]

[tex]$\$ 2.78 \mathrm{~g}=\$ 24.00-\$ 6.50$[/tex]

[tex]$\$ 2.78 \mathrm{~g}=\$ 17.50$[/tex]

[tex]$g=\frac{\$ 17.50}{\$ 2.78}$[/tex]

[tex]$g=6.30$[/tex]

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Can someone help me (Geometry)

Answers

Step-by-step explanation:

I think these is your correct answer .

What is the area of the shaded region? (Use 3.14 for Pi) *
10 cm
(2.5 cm
10 cm
Your answer


I need help

Answers

Answer:

The area of the shaded region is the difference between the areas of the rectangle and the square.

Step-by-step explanation:

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