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find the slope of
(2,1) and (0,5)
(3,5) and (1,2)
(2,7) and (9,2)
(-1,3) and (5,-1)
(-1,6) and (-1,8)
(2,-6) and (4,-9)
(7,-6) and (-5,-7)
(6,7 and (-6,7)
(-4,7) and (-4,8)​