Question

Which of the following tables represents a proportional relationship?
A.
x 2 3 4 5
y 3 6 9 12


B.
x 2 4 6 8
y 3 4 5 6


C.
x 4 6 8 10
y 6 9 12 15


D.
x 1 4 7 10
y 0 3 6 9

Answer 1

C

Table C is proportional because y/x = 6/4 = 9/6 = 12/8 = 15/10 = 3/2, so y = (3/2)x (constant ratio and goes through the origin).