Which equation represents a proportional relationship? y=2x2

y = 4x - 2

y = 1/2x + 3

y=5x

D: y = 5x

Step-by-step explanation:

According to Google, a proportional relationship is one in which two quantities vary directly with each other. We say the variable y varies directly as x if: y=kx. for some constant k, called the constant of proportionality. So the only one in that form would be the y = kx.

The constant k = 5