Question

-8a+32=72 what is the answer

Answer 1

To solve this, you need to isolate/get the variable "a" by itself in the equation:

-8a + 32 = 72       Subtract 32 on both sides

-8a + 32 - 32 = 72 - 32

-8a = 40     Divide -8 on both sides to get "a" by itself

$\frac{-8a}{-8} =\frac{40}{-8}$

a = -5

PROOF

-8a + 32 = 72     Substitute/plug in -5 into "a" since a = -5

-8(-5) + 32 = 72      (two negative signs cancel each other out and become positive)

40 + 32 = 72

72 = 72