I have an assignment where I'm told to plot the results of an equation with 2 independent vars vs one of its dependent vars.
i.e. f(x,y) = z , plot y vs z.
This makes no sense to me though, since wouldn't we NEED a 3d plot involving both x and y? Otherwise in 2d with just y vs z, I'd get some vertical lines which are meaningless.

>Is my professor a retard in this case, or me?