Plotting a 3 variable (X,Y,Z) graph

Hello all,

Short question:
Is it possible to plot a graph with 3 variables? If so, how?

Long question:
I have a data set which should correlate measured speed particles with distance and effective charge (explosives). Several equations allow me to estimate this speed. I used Excel Linear regression tool on each equation and one of the best results comes from a three variable equation. Now, to I would very much like to present the results in a graph. For this kind of analysis I usually use scatter point graph. However I tried to use the 3D graphs to be able to incorporate the third variable. This did not work (or I did not do it correctly). Anyone have encountered this problem before?

Thanks!

David