I need to find out how to solve this integral with the indicated changes/transformations. int.[0 to 2/3]int[y to 2-2y] (x+2y)e^(y-x) dxdy u=x+2y v=x-y I know that the xy region is x=y y=0 and y=1- (x/2) which is a triangle so I created systems with U and V but cant get a new bounded region... I just get u=v and two other lines that intersect at the origin. If anyone can tell me whats up with this it would be helpfull. Also, does it seem weird that my given v doesnt match the problem exactly? the u and v were given changes.