How do i multiply a unit fraction with a whole number?

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?

What is the difference between the equations of a vertical and a horizontal line?

Solve the equation. 2x - 8(x+1)= 6(2x - 3)