What is the constant of proportionality between yyy and xxx in the graph?

What is x and y intercepts for y=x+7

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?

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*