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**JohnDoe** Thanks for the reply but I did not understand what to do. On Wolfram Alpha when I enter the variables I can get the graph, but when I enter them in the same format on TI-89 Titanium I get the "Undefined Variable" error. How can I define the variable, which graph mode and which settings should I use? On the other hand when I use implict differentiation I get a graph that is not alike with the graph I get on Wolfram Alpha. I am very confused should TI89 not be able to graph such functions with ease?(BTW I am a high-school student and unfamiliar with implict differentiation)