A Dynamic Project to Help Students Understand the Slope and Y-Intercept of a Line.... by Douglas E. Lewit, graduate math major at Northeastern Illinois University and secondary education major at National-Louis University 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use DocumentTools in Do(%Plot0=plot(%Slider1*x+%Slider2,x=-20..20,color=COLOR(HSV,%Meter0,1,1),thickness=5,view=[-20..20,-30..30],axesfont=[Verdana,bold,10],gridlines=true,tickmarks=[[seq(5*n,n=-4..4)],[seq(5*n,n=-6..6)]],title="The Effect of Changing the Slope and Y-Intercept",titlefont=[Verdana,bold,12],labels=["X","Y"],labelfont=[Verdana,bold,14],caption=typeset("The slope of the line is %1.\134nThe Y-intercept of the line is %2.",%Slider1,%Slider2),captionfont=[Arial,bold,14])); end use; use DocumentTools in Do(%Plot0=plot(%Slider1*x+%Slider2,x=-20..20,color=COLOR(HSV,%Meter0,1,1),thickness=5,view=[-20..20,-30..30],title="The Effect of Changing the Slope and Y-Intercept",titlefont=[Verdana,bold,12],axesfont=[Verdana,bold,10],gridlines=true,tickmarks=[[seq(5*n,n=-4..4)],[seq(5*n,n=-6..6)]],labels=["X","Y"],labelfont=[Verdana,bold,14],caption=typeset("The slope of the line is %1.\134nThe Y-intercept of the line is %2.",%Slider1,%Slider2),captionfont=[Arial,bold,14])); end use; The plot above is dynamic, and demonstrates how a line changes as its slope and y-intercept vary over a range of values from -30 to 30. It's fun and very educational. The first slider controls the y-intercept of the line. The second slider controls the slope or amount of "slantiness" you might say. The meter changes the color, but you won't notice any change in the color of the line until you start playing with one of the first two sliders. Enjoy!!!