Which graph shows a set of ordered pairs that represents a function?

If 3x+8=3x+8 is it one solution or no solution

If you could answer these your a life saver

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?