Answer:
Yes, the relation is proportional
Explanation:
For a proportional relation, the ratio of X/Y (and thus Y/X) should be constant. You can verify, for examply dividing each Y by the corresponding X:
9 / -3 = -3
6 / -2 = -3
-3 / 1 = -3
-6 / 2 = -3
-9 / 3 = -3
As you can see, the ratio is the same, so the relation is proportional.