Question

What is the value of y so that the ordered pair (5, y) is a solution to the equation –5x + y = –40? explain it to me please ^-^

A.
–65

B.
9

C.
–15

D.
7

Answer 1

5x+y=-40; (5,y)
Plug in (5) into the equation.

5(5)+y=-40
25+y=-40
y=-40-25
y=-65

Any questions? :)

Answer 2

It should be A. -65
So if you want to check your answer you can do it like,

(5, -65)
Plug this point into your original equation.
5x+y=-40
5(5)+(-65)=-40
25-65=-40
-40=-40 therefore, (x,y) are correct solutions.

Answer 3

@karinaGperez
Try it this way:
–5x + y = –40
Plug in 5 for x and solve for y
-5(5) + y = -40
-25 + y = -40
y = -15