find the following inverse functions

Question

f(x) = 1 - 1⁄x

f^-1

y= f(f^-1(x))

Answer 1

y = 1 + 1/x

x = 1 + 1/y

x - 1 = 1/y

1 / (x - 1) = y

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