Graphs
Sources
Algebra.com, "Lesson on Graphing Functions." http://www.algebra.com/algebra/lessons/graphing/ (accessed August 15, 2010)
Stapel, Elizabeth. "Using Slope and y-Intercept to Graph Lines." Purplemath. Available from http://www.purplemath.com/modules/slopgrph.htm. Accessed 11 August 2010
Uploader, Siyavula. "Finding the equation of a straight line graph from a diagram." Connexions. August 12, 2009. http://cnx.org/content/m31271/1.1/.