Answer
$x/3 - 2/3=y$
Work Step by Step
In order to find the inverse of a function, we first switch f(x) with y to obtain:
y=3x+2
Because it is an inverse function, that means that we switch x and y and then put the equation in terms of y:
$x=3y+2 \\\\ x-2=3y \\\\ x/3 - 2/3=y$