Question

What is the inverse of the function f(x) = 1/9 x + 2

Answer 1

9x -18

Explanation:

f(x) = 1/9 x + 2

Let y = 1/9x +2

Exchange x and y

x = 1/9 y +2

Solve for y

Subtract 2 from each side

x-2 = 1/9 y +2-2

x-2 = 1/9 y

Multiply each side by 9

9(x-2) = 1/9 y *9

9x -18 = y

The inverse is 9x -18