Systems of Equations and Inequalities
Math so cool, its ice cold. Covers systems with three equations, including all the freaky stuff that happens when there isn't one solution. The site also includes games and the much-, much-needed stress relief section.
This website goes all the way back to the very basics about inequalities. If you just need a break, play the Alien Attack game.
Paul knows his stuff, and he'll make sure you know his stuff, too.
What rhymes, what rhythm. Get up and shake down with this math rap about solving systems of equations.
Patrick's soothing voice guides us through the elimination, with a number of thoroughly explained problems.
Not only does this place have a ton of videos, they also have multiple videos by different people explaining the same problem, each in their own way. Some of their explanations are in Spanish, too. Shmoop approves.
Take another crack at that 3D graph with a well-done video by Khan.
Games and Tools
Test your knowledge and skill as you race against the cockroaches to find the equation of a line in slop-intercept form. Smashing them with a rocket is surprising therapeutic.
Don't own a graphing calculator? Never fear—here's a free calculator to quickly solve systems of equations. Simply plug in your coefficients and constants and *bam* instant answers. We trust you to use it to only check your answers.
Calling all crossword lovers…if you happen to want math vocabulary in your crossword puzzles. They also have flip cards and pinball.