The graph below shows the price, y, in dollars, of different amounts of gumballs, x, in pounds: a graph titled gumball prices shows number of pounds on x axis and price in dollars on y axis. the scale on the x axis shows numbers from 0 to 12 at increments of 2, and the scale on the y axis shows numbers from 0 to 24 at increments of 4. a straight line joins the ordered pairs 0, 0 and 12, 24 which equation best represents the relationship between x and y?