find slope line contains each pair points 8 2 7 and 4 4 9 1 5 and

Find the slope of the line that contains each pair of points.

8. (2, 7) and (4, 4)
9. (-1, -5) and (-9, -1)
10. (5, 3) and (-2, 0.5)
11. (3/4, 7/5) and (1/4, 2/5)
12. (-2, 3) and (2, -3)

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