In the circle E shown. Points C, E, and D lie on a straight line. The length of line EF is given to be 3x + 11. Which of the following is the length of line segment CD?

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?