Good Evening Tutors, I would like to know how to reverse the order of integration for the double integral questions below

8. Sixly dy dx 9. (x - 1)dy dx 10. Safe-x dx dy 11. So Syzyedx dy 12. (4x + 10y)dy dx13. JJ xy dA ; S is the region bounded by y = x and y = 1. 14. JJ, (x + y)dA ; S is the triangular region with vertices (0, 0), (0, 4) and (1, 4). 15. JJ (x2 + 2y) dA ; S is the region between y = x and y = vx