Find the slope of the line through each pair of points.

5) (-6,-11),(-20,16)
6) (-3,12),(-4,15)
7) (3,4),(4,1)
8) (10,0),(11,5)
9) (-4,-5),(11,-11)
10) (3,-12),(2,-2)
11) (-14,-11),(17,-20)
12) (-11,-5),(13,11)
13) (-19,-7),(4,4)
14) (4,12),(15,15)