This table gives a few (x, y) pairs of a line in the coordinate plane. (-72,25)
(-54,13)
(-36,1)
What is the y-intercept of the line?

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?