Students should understand that two variables show direct variation if y = kx and k is not equal to zero. k represents the constant of proportionality. In the equation, the two variables, y and x, vary directly to each other as they represent proportional relationships.
The number of calories consumed from a fun size piece of candy is directly proportional to the number of candies eaten. If 3 candies contain 24 calories, how many candies would you have to eat to consume 960 calories? Justify your thinking.