Divide each y-coordinate by its corresponding x-coordinate except for the point (0, 0). If every division gives you the same answer, it is proportional.
Table A: 2/(-2) = -1 3/(-1) = -3 Since -1 and -3 are different, this is not proportional.
Table B: -3/(-1) = 3 3/1 = 3 6/2 = 3 All divisions give the same answer, 3. This is proportional.