This is a pretty standard Calculus problem. If you were given it as home work you should have been givensomeinstruction.

One of the "coordinate plane boundaries" is z= 0. on the curve which goes from (0, 1) to (1, 0).

So take x from 0 to 1 and, for each x, y from 0 to . And of course z goes from 0 up to .