The cost y (in dollars) for x pounds of a trail mix is represented by the equation y=4x. The graph shows the cost of a granola snack. a. What is the rate of change for the granola?

b. What is the rate of change for the trail mix?

c. Which snack food costs more per pound?

d. If a graph was drawn for the trail mix, which of the two stacks would have a steeper line?

e. Which of these snack-cost relationships is proportional?