17. Use the distance formula to show that the triangle with vertices (2, 3), (- 3, 3), and (- 3, 1) is a right triangle. -+ X 18. List the members of the relation, and identify the domain and range: R = (x, y) | 3y = 3 - 2x ; X E {0, 2, 4, 6} } 19. List the members of the relation, R, if x is an integer, y = 2x - 1, and - 3