Where a is the slope, and b is the y-intercept.

To graph a line enter the parameters (i.e., a, b) and hit New Plot. Up to 5 plots can be displayed at one time. The Clear button will remove all plots. To see the parameters for each plot hit the Legend on/off button. The Redraw button will refresh the graph. This is useful when the function domain (i.e., x) has been changed. To see the value of each plot at a given point, move your cursor to the desired location then click and hold.