The way to find out is, for each table, divide each y-coordinate by its corresponding x-coordinate. If all the divisions give you the same answer, that relationship is proportional.
A. 4/-2 = -2
16/-4 = -4
Two divisions are already different. A. is not the answer.
B. -8/-4 = 2
-12/-6 = 2
-18/-8 = 2.25
Not all quotients are equal. B. is not the answer.
C. 5/-3 = -5/3
3/-5 = -3/5
Quotients are not equal. C. is not the answer.
D. 12/-3 = -4
24/-6 = -4
36/-9 = -4
All quotients are equal.
Answer: D.
