Six friends went to a hockey game. the price of admission per person was $x. four of the friends bought a soda for $2. wright and simplify an expression that represents the total cost.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Ineed to know the answer to this algebra question.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?