8. [-/1 Points] DETAILS SCALCET9 15.9.025.MI. MY NOTES ASK YOUR TEACHER PRACTICE AN Evaluate the given integral by making an appropriate change of variables. JR 5X - By dA, where R is the parallelogram enclosed by the lines x - 8y = 0, x - 8y = 6, 3x - y = 1, and 3x - y = 2 3x - y Need Help? Read It Watch It Master It 9. [0/1 Points] DETAILS PREVIOUS ANSWERS SCALCET9 15.9.027. MY NOTES ASK YOUR TEACHER PRACTICE A Evaluate the integral by making an appropriate change of variables. 12 9 cos (7 ( * * ) dA where R is the trapezoidal region with vertices (4, 0), (10, 0), (0, 10), and (0, 4) X Need Help? Read It Watch It