I need help I don't know how to solve 2-5

Abag of popcorn contains 483 calories and servers 3.5 people. how many calories are in each serving.

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.