Systems of equations and inequalities
http://www.classzone.com/cz/books/algebra_1_2007_na/resources/jsp/puzzles_games/puzzles_game3.jsp
http://www.classzone.com/cz/books/algebra_1_2007_na/resources/applications/animations/explore_learning/chapter_3/dswmedia/alg107_ch03_pg139.html
http://www.classzone.com/cz/books/algebra_1_2007_na/resources/applications/animations/explore_learning/chapter_3/dswmedia/alg107_ch03_pg154.html
http://www.quia.com/cb/79607.html?AP_rand=1727721762
http://www.glencoe.com/sec/math/algebra/algebra1/games.htm