Which equation represents a proportional relationship? A. y=−3x+2 B. y=12x C. y = 3x D. y=2(x+13)

As written here, both choices B and C represent proportional relationships:... B. y = 12x... C. y = 3x_____One key to a proportional relationship is that when one variable is zero, so is the other. This will not be the case for selections A and D.