Section 11.3: Lines
Links

Graphing Lines These interactive sites allows you to enter a linear equation and then it will draw the line.
http://www.majormath.com/equationgraphbasic.htm

Graphing Practice
(multiple choice)
http://cne.gmu.edu/modules/dau/calculus/graphing_funcs/gfex_frm.html

Graphing Functions
This site Links together the ideas of plotting points, functions and graphing.
http://cne.gmu.edu/modules/dau/calculus/graphing_funcs/glf_frm.html

ReneÔ Descartes Did you notice the Situation at the beginning of this section? If you want some additional information, you can check out this site.
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Descartes.html