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
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Answer 1

Answer:

1st option

Step-by-step explanation:

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

y = $\frac{1}{9}$ x - 2 ( add 2 to both sides )

y + 2 = $\frac{1}{9}$ 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