I need help, please help me if you understand. I don’t know what I’m supposed to do, if you know how please show me step by step how to solve these type of problems.

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?