Question

For the function f(x)= x/4 find x if f(x)=-8

Answer 1

Remark

Let y = f(x)

Now we have y = x/4

It is much easier to solve in this form

y = - 8

- 8 = x/4      Multiply both sides by 4

-8 * 4 = (x/4) * 4

- 32 = x  <<<< Answer

Answer 2

In other words, equate x/4 and  -8 and solve for x:  Mult. both sides of this equation by 4:  x = -32