Answer
$ -x/2 -1/2=y$
Work Step by Step
In order to find the inverse of a function, we first switch f(x) with y to obtain:
y=-1-2x
Because it is an inverse function, that means that we switch x and y and then put the equation in terms of y:
$x=-1-2y \\\\ x+1=-2y \\\\ -x/2 -1/2=y$
