Alice is buying decorations for a christmas party. she buys 3 strands of red ribbon that is $9 each. she buys 6 strands of white ribbon for x dollars each. all together, she spent $28. how much were the white ribbon?

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?