a store sells packages of comic books with a poster. a poster and 2 comics cost $7.50. a poster and 11 comics cost $16.50. 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 $7.50. use pencil and paper. explain which store has the better deal. the linear function rule is y  equals=