Does the equation represent a direct variation? y = x + 9

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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?

Which of the functions below could have created this graph?