Question

Solve this system by substitution:

Y = -5x + 8
-7x + 5y = -24

Please show work

Answer 1

substitute y in the second equation so the second equation becomes

-7x + 5(-5x + 8) = -24

do you understand so far?

Answer 2

now solve it
-7x + 5(-5x + 8) = -24
-7x + -25x + 40 = -24
(i multiplied 5 by -5x and got -25x and i multiplied 5 by 8 and got 40)
-7x + -25x = -24 - 40
-7x + -25x = -64
-32x = -64
divide both sides by 2
x = 2

Answer 3

did you understand? @mstrong_14