Johnathan is making his famius pasta dish his mom ate 2/7 of pasta and his brother ate 1/6..how much did they eat at all

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?