Please help with this question (d+2)(-7)

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

The graph of a line gets what as the value of the slope gets bigger

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?