Question

If the output of the equation f(x)=3x+7 is -2 what is the input and how do you solve it?

Answer 1

-2 = 3x + 7

subtract 7 from both sides

-9 = 3x

divide by 3

-3 = x

check

-2 = 3 (-3) + 7

-2 = -9 + 7

-2 = -2