how do i plot a function of two variables in mathematica?

[lordy12]

guic

[qualgorithm]

Try ContourPlot, Plot3D, etc. Mathematica has plenty of built in documentation.

I don't think this is the proper forum for this sort of question.

[CompuChip]

Plot3D[x^2 - y^2, {x, -5, 5}, {y, -5, 5}, AxesLabel -> {x, y, z}]
works for me.

[adm_strat]

Look up Plot3D in the help, it gives examples on how to use the function. Sometimes you need to import graphics packages before you can use certain functions in there. I don't think Plot3D needs and packages but implicit functions might. I has been a while since I have used Mma.