Your answer is choice D:
By equation, the form of a proportional relationship is y = kx
By graph, a proportional relationship can be noticed by observing the graph of the line passing through the origin.
By Table, a proportional relationship will satisfy the following: [tex]k = \frac{y}{x} [/tex] where k is the constant of proportionality.
In choice D, divide each y coordinate in the table by its corresponding x coordinate and you will see that the answer is 1.5 for each.. This is your k, or constant of proportionality.
