The function f

Question

is defined by f(x)=-3x+15
. If f^-1
is the inverse function of f
, which of the following tables correctly shows some values of x
and the corresponding values of f^-1(x)
?

Answer 1

The inverse function of f(x)=-3x+15 is f^-1(x) = (-x+15)/3.

Here is a table that shows some values of x and the corresponding values of f^-1(x):

| x | f^-1(x) |
|------|---------|
| 0 | 5 |
| 5 | 0 |
| 10 | -5 |
| 15 | -10 |
| 20 | -15 |