21/2 divided by 4. can you answer i need

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 an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Do you mind if you guys me with this question i’m on number 8