Write a function representing the line that includes the points (3,3) and (-6,15)

How is working backward similar to solving an equation?

Solve 3x-18=2y and 5x-6y=6 by elimination show work

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?