Answer:
2 No
3 Yes
Explanation:
x = ky
Substitute the values of x and y to check if it's proportional. Then solve for k. If k is the same for all 4 equations, then 2 is proportional.
6 = -2k, k = 6/-2, k = -3
7 = -1k, k = 7 / -1, k = -7
8 = 0k, k = 8 / 0, k = 0
9 = k, k = 9
2 is not proportional.
Substitute the values of x and y to check if it's proportional. Then solve for k. If k is the same for all 4 equations, then 3 is proportional.
-70 = -10k, k = -70 / -10, k = 7
-56 = -8k, k = -56 / -8, k = 7
-14 = -2k, k = -14 / -2, k = 7
-7 = -k, k = -7 / -1, k = 7
3 is proportional.