Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsSlope and Equations of Lines through Pointshttp://demonstrations.wolfram.com/SlopeAndEquationsOfLinesThroughPoints/]]>http://demonstrations.wolfram.com/SlopeAndEquationsOfLinesThroughPoints/