Answer:
f^-1(x) = 9(x+2)
Step-by-step explanation:
y = 1/9 x -2
We want to find the inverse
Exchange x and y and then solve for y
Exchange x and y
x = 1/9 y -2
Now solve for y
Add 2 to each side
x+2 = 1/9y-2+2
x+2 = 1/9y
Multiply each side by 9
9*(x+2) = 1/9y*9
9(x+2) = y
This is the inverse
f^-1(x) = 9(x+2)
