I need something to make graphs with. The graphs are pretty basic, but I need the ability to make line graphs, and multiple lines on one set of axis. I don't know if this is possible in Excel. I have '07 so let me know how to do it if it is at all possible. If not, is there any good applications out there? I've download some in the past but they all lack something. They're not exactly simple to use either. It's for high school physics and ap biology, so it's not going to be complicated stuff.