I am trying to plot a two variable expression in single 2D plot but have been unsuccessful.

I already have an equation in two variables that is obtained through a lengthy process of calculations:

DEQ = A*D + B*Ne, where A and B are constants, and D and Ne are variables.

I can easily plot a 3D graph of this, but I'd also like to plot what are essentially slices of the 3D graph onto a 2D graph. Actually to plot several slices on a single 2D graph.

I have tried to do the following but have been unsuccessful:

I am using plot3d for the first time. It is cutting off the z-axis under certain rotations (both the axis label and the top of the plot). I am using Maple 11.01

Has anyone else experienced this problem, and how do I fix it?

thanks.