A store sells packages of comic books with a poster. A poster and 6comics cost ​$14.75. A poster and 14comics cost ​$22.75. Write a linear function rule that models the cost y of a package containing any number x of comic books.
Suppose another store sells a similar​ package, modeled by a linear function rule with initial value ​$8.99. Use pencil and paper. Explain which store has the better deal.
Y=