To shape service similar create and solve a proportion to find the value of X then find the measure of the unknown side

Find the slope of the line y =8/9x + 1.

One positive number is 9 more than twice another. if their product is 95, find the numbers

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?