Question

In the expression y=3x+7 what does the input have to be in order for the output to be -2?

Answer 1

x=-3

Explanation:

y=3(-3)+7

y=-9+7

y=-2

Answer 2

x= -3

Explanation:

you replace y with -2 as the output

then subtract the 7 on both sides to have '-9=3x'

divide by 3 on both sides

x= -3