Integrate R(x+y) dA\displaystyle \int_{{R}}{\left({x}+{y}\right)}\ {d}{A}. Sketch the given region R and then the new region in the uv plane. R is bounded by 0x5,xyx+10\displaystyle {0}\le{x}\le{5},{x}\le{y}\le{x}+{10}.
Let x=5uandy=10v+5u\displaystyle {x}={5}{u}{\quad\text{and}\quad}{y}={10}{v}+{5}{u}.