3. A trail mix recipe asks for 4 cups of raisins for every 6 cups of peanuts. There is a proportional relationship between the amount of raisins, r (cups), and the amount of peanuts, p (cups), in this recipe.

a. Write the equation for the relationship that has a constant of proportionality greater than 1. Graph the relationship.

b. Write the equation for the relationship that has a constant of proportionality less than 1. Graph the relationship.