f[x_, y_] := x^2 + y^2 == 25
Plot[f[x, y], {x, -20, 20}, {y, -20, 20}, AxesLabel -> {x, y}]
Plot::nonopt: Options expected (instead of {y,-20,20}) beyond position 2 in Plot[f[x,y],{x,-20,20},{y,-20,20},AxesLabel->{x,y}]. An option must be a rule or a list of rules. >>
Ideally, after getting Plot to work, I would like to hand the same function to RevolutionPlot3D to generate a sphere.
Thanks.