Question

http://prntscr.com/20n1kj

Answer 1

u have to do the reverse of the functions

Answer 2

f(x) = (1/4)x + 3

step 1: let f(x) = y:

y = (1/4)x + 3

step 2: swap every x for a y and vice versa:

x = (1/4)y + 3

step 3: put it back in the form y = f(x). the new simplified y = f^{-1}(x) [inverse of f(x)]

y = 4(x - 3) = f^{-1}(x)