Two dimensional linear fit?

I would like to do a two-dimensional linear fit. Specifically, I have data set {x1(j),x2(j),y(j)} such that y(j) = a0 + a1*x1(j) + a2*x2(j). I would like to do some kind of fit to extract a0, a1 and a2.

Can this be done with Mathcad?

Thanks!

Bill Edelstein

Johns Hopkins University

Baltimore, MD