Question

Given f(x) = ax - b, what is f^-1(x)?

Answer 1

x + b/a Replace f(x) with y, interchange x and y and solve for y.

Answer 2

A)

Explanation:

f(x) = ax + b

y = ax + b

x = ay + b

ay = x - b

y = (x - b)/a

f^-1(x) = (x - b)/a

Answer: A)