Answer
$y=-x/7 +2/7$
Work Step by Step
In order to find the inverse of a function, we first switch f(x) with y to obtain:
y=2-7x
Because it is an inverse function, that means that we switch x and y and then put the equation in terms of y:
$x=2-7y \\\\ x-2=-7y \\\\ y=-x/7 +2/7$