What is the most precise term for quadrilateral ABCD with vertices A(1, 2), B(2, 6), C(5, 6), and D(5, 3)?

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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?

The anwser cause i do not understand just plez