(10, 4) and (4, 15)
(-4, -8) and (2, 6)
(-3, -1) and (3, 4)
(-1, 5) and (6, 5)
(2, 1) and (6, 10)
(4, 6) and (4, 2)
(-1, -2) and (2, 2)
(-2, 3) and (3, 2)
(-3, 1) and (-1, 5)
(-1, 1) and (1, -2)
Undefined
m = 0
m = 7/3
m = 4/3
m = 5/6
m = - 1/5
m = - 11/6
m = 2/1
m = - 3/2
m = 9/4
