Given: u = [1 3 −5 2 14 11 −8 0 5] (3x3 matrix) v = [13 −1 −7 −6 1 19 0 15 23] (3x3 matrix) solve: x + u = v

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?