C.Find the slope of the line containing each pair points. 1. (4,5), (11, 9) 2. (4,8), (1,5) 3.(-1,-2),(7,1) 4. (-3, 6), (-3,1) 5. (6, -3), (6,4) 6.(2 1/2, 3/2),(-½,½) 7. (0,5), (10, 5) 8. (1.75, 2), (1.75, 0) 9. (a + b, 4), (a-b, 8) 10. (5, a+ b), (2, a-b ​