For each table, answer: What is the constant of proportionality?
a b
2 14
5 35
9 63
1/3 7/3

a. b

3 360
5 600
8 960
12 1440
a b
75 3
200 8
1525 61
10 0.4
a b
4 10
6 15
22 55
3 7/1/2