Inverse of f(x)=7/5x-21

Answer pls man im trying to get out of summer school

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)

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?