This applet can be used to determine whether one relation is a function or not by using the Vertical Line Test.[br][br]The Vertical Line Test says that if some vertilcal line meets the graph in more than one point then the relation is not a function.[br][br][list][br][*]In the input box enter a polynomial equation of x and y in the form [b]"polynomial = number"[/b].[br]For example, to graph [math]y = x^2[/math], enter [math]y - x^2 = 0[/math][br][*]Drag the slider to use the vertical line test.[br][/list]