In which table does y vary directly with x?

Question

A.
x y
1 3
2 9
3 27
B.
x y
1 -5
2 5
3 15
C.
x y
1 -18
2 -9
3 9
D.
x y
1 4
2 8
3 12

Answer 1

The correct answer is C.
In table C, y varies directly with x because when x is multiplied by a constant factor of -9, it gives us the corresponding values of y.