Question

Which representation represents a proportional relationship?


A
x
2
4
6
8
y
6
8
10
12


B
y = 2 x + 2


C
On a coordinate plane, a line goes through points (negative 1, 0) and (0, 1).



D
x
4
7
12
15
y
8
14
24
30
A
B
C
D

Answer 1

D

Reason: In D, y/x = 8/4 = 14/7 = 24/12 = 30/15 = 2, so y = 2x (constant ratio).
A has varying y/x, B has y-intercept 2 (not through origin), and C has y-intercept 1, so none of those are proportional.