The science club went on a two-day field trip. the first day the members paid $60 for transportation plus $12 per ticket to the planetarium. the second day they paid $95 for transportation plus $9 per ticket to the geology museum. write an expression to represent the total cost in dollars for two days for the n members of the club.

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?