Evaluate the following integral using a change of variables. 1y+3 J-Idedy 0 Y E) 1y+3 I I lx-ydxdy=E| 0 Y (Type an exact answer. Use integers or fractions for any numbers in the expression.) Evaluate the following integral using a change of variables. y - X 4 y + 2x + 1 dA, where R is the parallelogram bounded by y - x = 1, y - x =2, y + 2x =0, and y + 2x = 4 R . . . 4 y - X dA = y + 2x + 1 R (Simplify your answer.)