8. A particular cookie recipe calls for one cup of flour to start, along with an additional one-half cup of flour for every cup of sugar. Let x represent the amount of flour used (measured in cups) and let y be the amount of sugar used (measured in cups). Which of the following statements is true? (a) x and y are proportional. (b) Ax and Ay are proportional. (c) The y-intercept is the point (0, 0). (d) Three cups of sugar correspond to 1.5 cups of flour used. (e) All of the above statements are true