All of these functions created graphs that had inverses. The way to tell what the inverse of your graph is to switch around your x and y values and that should give you your inverse. Now, finding out if it is a function or not is a little bit different. To find out if your new graph is a function it must pass the vertical line test, that means you draw vertical lines all throughout your graph and if two points of your graph touch the same line it is not a function. One point per line and it is a function.