This educational site will get even the weakest student excited about math. Here there are video games devoted to algebra, trig and geometry. This approach is very effective in grabbing and holding student attention as graphing is addressed at all levels of math.
Of course, nothing takes the place of a teacher, but imagine every student having an iPad or laptop for 10 or 15 minutes a day to practice strengthening her/his skills in math using such a site. As with many games, weak students could easily find support from the stronger students since it is a "game." Imagine a lively math class where every student knows that success is just around the corner:)
Along with the games are many activities related to plotting graphs. Note that any of the textbook answers are NOT free so just stay with the games and exercises. I am not a math person, but I enjoyed killing the insects:)
ELL TEACHER PROS