I wonder if it is possible to graph |x|+|y|=x^2+y^2 function on TI89 Titanium if so can someone please provide me step-by-step instructions because I always get stuck with the "Undefined Variable" error. No matter what I have done I could not manage to solve the problem. Thanks for your contribution.
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)