3 years ago

X=2y-47x+5y=-66 what is the x- value

Mathematics

1 answer:

Gwar [14]3 years ago

5 0

Answer:

x = -8

Step-by-step explanation:

x = 2y - 4 --- Equation 1

7x + 5y = -66 --- Equation 2

I will be using the substitution method to solve this.

Substitute x = 2y - 4 into Equation 2:

7x + 5y = -66

7(2y - 4) + 5y = -66

Evaluate.

14y - 28 + 5y = -66

Evaluate like terms.

19y - 28 = -66

Isolate 19y.

19y = -66 + 28

= -38

Find y.

y = -38 ÷ 19

y = -2 --- Equation 3

Substitute y = -2 into Equation 1:

x = 2y - 4

x = 2(-2) - 4

Evaluate.

x = -4 - 4

x = -8

You might be interested in

The following stem-and-leaf plot represents the scores earned by Mr. Wood's class on their most recent science test.

rewona [7]

Answer:

i think 10?

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Plz help, 20 points for a answer, plz help asap

ycow [4]

If we round it
1) 7 people
2) 4 people
3) 5 people

6 0

3 years ago

12. (07.06 LC) A library building is in the shape of a rectangle. Its floor has a length of (3x + 5) meters and a width of (5x −

Goshia [24]

ANSWER

$15 {x}^{2} + 22x - 5$

EXPLANATION

It was given that, the length of the rectangular building is

$(3x + 5) \: meters$

and the width of the is

$(5x - 1) \: meters$

The area of a rectangular building is calculated using the formula for finding the area of a rectangle.

$A = l \times w$

Since the dimensions are given in terms of x, the area is also a function of x,

$A(x) = (3x +5 )(5x - 1)$

We expand to get,

$A(x) = 3x(5x - 1) + 5(5x - 1)$

$A(x) = 15 {x}^{2} - 3x + 25x - 5$

$A(x) = 15 {x}^{2} + 22x - 5$

meters square

8 0

4 years ago

PLEASE DON'T ANSWER IF YOU DO NOT KNOW

7nadin3 [17]

Answer:

its old so u passed it so can i take the pionts

Step-by-step explanation:

3 0

3 years ago

Tonya wants to estimate what proportion of the students in her dormitory like the dorm food. She interviews a simple random samp

Oxana [17]

Answer:

Step-by-step explanation:

The solution of the problem has been solved on paper and attached in the attachment section. Kindly refer to that and feel free to ask any doubt.

5 0

3 years ago

X=2y-47x+5y=-66 what is the x- value​

X=2y-47x+5y=-66 what is the x- value