i'm having a small problem with changing variables.
u = x and v = xy, i am having trouble getting y in terms of v.
if my region of integration is needed here it is: from x = 1 to x= 2 and xy = 1 to xy = 2
The transformation is . If is the function you are integrating then . Where . And . Thus, for a point to we be in we require that , thus, . Thus, the this new set you are integrating over is simply the rectangle .