Question

Given the function f(x)=9x+7, find its inverse.

Answer 1

$f(x)=9x+7\\ y=9x+7\\ 9x=y-7\\ x=\dfrac{1}{9}y-\dfrac{7}{9}\\ f^{-1}(x)=\dfrac{1}{9}x-\dfrac{7}{9}$