4.) A customer at a concession stand bought 2 boxes of popcorn & 3
 drinks for $12. Another customer bought 3 boxes of popcorn & 5
 drinks for $19. How much does a box of popcorn cost? How much does
 a drink cost? Write and solve a system of equations
 Equation 1 :
 Equation 2:
 Popcorn
 Drink: