The way to find the inverse of a function is to input y wherever there is an x, and put x wherever there is a y then solve for y. Also, the inverse of functions is graphed as a reflection over the axis y=x. Even though my graph didn't completely match up when I folded the plastic sheet through the y=x axis, that's how it's done.. It's only crooked because I didn't do a very good job drawing the parabolas. I think that some functions that can have inverses that are also functions; not parabolas though.