1: down 1, over 4 (-1/4)
2: up 2, over 3 (2/3)
3: down 3, over 3 (3/3 or 1)
4: undefined ( because all the points on the line have the same x value)
5: 0 ( because x can be any value)
6: 5/3
7:6/-12 or 1/-2
8: -12/4 or -3
9: 12/-10 or 6\-5
10: -4/-1 or 4
11: 0/15
12: -3/4
13: 8/4 or 2
14: 11/0
