Write a system of equations to describe the situation below, solve using elimination, and fill in the blanks.
The Whitehead family and the McKee family are seeing a movie together in the theater. At the concession stand, Mr. Whitehead paid $31 for 4 large popcorns and 3 large drinks that his family will share. Mrs. McKee bought 2 large popcorns and 3 large drinks and paid $23. How much does each item cost?
A large popcorn costs $ and a large