Darla has a recipe for pot roast. There is a proportional relationship between the weight (in pounds) of the pot roast, x, and the total cooking time (in hours), y. Her recipe says that a 6-pound pot roast should take 3 hours to cook.
The equation for the relationship between x and y is Response area = Response areaResponse area
If Darla's pot roast weighs Response area pounds, it will take Response area hours to cook.