Question

If (a,-8) is a solution to the equation -a=4b-7, what is a?

Answer 1

-a=4b-7

First, solve for b

-a=4b-7

-a+7 =4b

(-a+7)/4 =b

b= (-a+7)/4

Since (a,-8)

-8 = (-a+7)/4

Solve for a:

-8 (4)= -a+7

-32 = -a+7

a= 7+32

a= 39