Free points have a great day stay cool :D

Ineed asap.i cant understand this question i need someone to me right away

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?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.