Question

Which is a Proportional Relationship?

A. x + y=3
B. y= 3x^2
C. y= 4x - 1
D. y= 12.5x

Answer 1

If x and y are proportional, then the quotient y and x is constant.

`(y)/(x)=a-constant`

The equation of a Proportional Relationship:

`(y)/(x)=a\qquad\text{multiply both sides by }\ x\\eq0\\\\y=ax`

Therefore your answer is

D. y = 12.5x