B) You just got a free ticket for a boat ride! you can bring 2 friends. The hard part is you have 5 friends who want
to come... How many different groups could you invite?

The cost varies directly with the number of tickets purchased. it costs $145 for 10 people to attend a concert. a. what is the constant of proportionality (k)? b. write the direct variation equation. c. home much does it cost for 8 people? d. graph this situation. be sure to label each axis and give the graph a title.