The graph below shows the relationship between the number of dollars x and the number of tickets you can buy y. Tell whether the quantities are in a proportional relationship. If so write an equation that represents the relationship.
A. This relationship is proportional. The equation is y=1/12x.
B. This relationship is proportional. The equation is y= 12x+4.
C. This relationship is proportional. The equation is y=12x.
D. This relationship is not proportional