Question

If f (x) = one-ninth x minus 2, what is ?

A.
B.
f - 1 Baseline (x) = one-ninth x + 2
f - 1 Baseline (x) = -2 x + one-ninth
Please see picture: helpppppp

Answer 1

Answer: A

Explanation:

GOT IT RIGHT ON EDG TEST

Answer 2

1st option

Explanation:

let y = f(x) and rearrange making x the subject , that is

y =
`(1)/(9)` x - 2 ( add 2 to both sides )

y + 2 =
`(1)/(9)` x ( multiply both sides by 9 to clear the fraction )

9(y + 2) = x

9y + 18 = x

change y back into terms of x with x =
`f^(-1)` (x) , then

`f^(-1)` (x) = 9x + 18