Jacinta compares the volume of two boxes. Both boxes have a width of 2.5
2.5 inches, and a height of
10
10 inches. The larger box has a length of
8
8 inches. The smaller box has a length that is
75
%
75% of the length of the larger box.

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?