Question

If f(x)=1/9x-2, what is f^-1(x)

Answer 1

the inverse is 9x + 18

Explanation:

switch 'x' with 'y'

y = 1/9x - 2

x = 1/9y - 2

solve for y now, start with multiplying each side by 9

9x = y - 18

y = 9x + 18

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