The graph shows the proportional relationship between the number of sodas you buy and the cost of the sodas. Identify the constant of proportionality and write an equation for the proportional relationship.


A: k=3; y=3x


B: k=2; y=2x


C: k=4; y=4x


D: k=7; y=7x

The graph shows the proportional relationship between the number of sodas you buy and the cost of the sodas Identify the constant of proportionality and write a class=