Solve for x

first person to answer this correctly will be named brainliest

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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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?