Use a change of variables and the Jacobian to find the volum

Use a change of variables (and the Jacobian) to find the volume of the solid region lying below the surface z = f(x,y) and above the plane region R. Picture of the solid

f(x,y) = (x+y)ex-y
R: the region of the xy-coordinate plane bounded by the square with vertices (4,0), (6,2),
(4,4), and (2,2) i need to know how to solve this problem for my test today, thaks