At a candy store selling gourmet jelly beans, the amount you pay varies directly with the weight of the beans. The cost of 5 pounds of jelly beans is $12. During the past month $7200 worth of jelly beans were purchased. How many pounds of jelly beans were purchased during the past month?

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?