I mentioned to you in a previous post that to find the inverse of a function y = f(x) we needed to reverse the roles of x and y and solve the equation x = f(y). Then y = g(x) is our inverse function.

The meaning behind this is quite simple: the graph of the inverse function is the graph of the original function reflected over the line y = x. I can't sketch it for you, but that's the concept.

-Dan