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Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

Place the following steps in order to complete the square and solve the quadratic equation,

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?