http://www.terragon.com/tkobrien/algebra/
If you go to this site, click on the link at the top, or the picture.
From there, it will have a pop-up! On the pop-up put your mouse on the Topics button on the left.
There are two to choose from: Topics 1-6, and Topics 7-12. If you choose the Topics 7-12, make sure you move your pointer to slightly go around the Topics 1-6 button.
This site seems to be really good for graphing, etc. That's what I'm doing now.
...Trying to learn how to graph y=1.5x +1 using the slope-intercept form.