One third of a number is no more than nine. ( what is the equality)

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?

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)

Im so bad at fractions they are not my best math thing to work on