Question

If 3x + y = 12, find a when y = -15

Answer 1

x= 9

Explanation:

3x - 15 = 12

add 15 to both sides

3x = 27

divide both by 3

x= 9

Answer 2

9 is the answer

Explanation:

3x+-15=12

you add 15 to 12 which is 27, 3x/27=9