Originally Posted by

**Kuma** When you want to take a double integral of some function involving x and y.

Say for example 0<x<1 and 0<y<1

That means that you are integrating over a triangle really. And the slope of the line is

y = 1-x

My question is, what would you use as the bounds of the integral? My prof said that the bounds of x are from 0 to 1, but the bounds of y are from 0 to 1-x? Or something like that. Can someone please explain this, I don't understand why the bounds of y just cant be 0 to 1.

Thanks.