Which linear equation represents a non-proportional relationship?

Question

Responses
A y = 1/2 x y = 1/2 x
B y = −1/2 x + 5y = − 1/2 x + 5
C y = −1/2 x y = − 1/2 x
D y = 0.2x

Answer 1

B y = −1/2 x + 5y = − 1/2 x + 5