Can someone help me please, ASAP!!

Answer question above and explain each step : )

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?

Find all solutions for 2y - 4x =2 y = 2x + 1 site: socratic.org