7. At a fall festival, a student council sold two types of drinks: hot chocolate and apple cider. The student council earned $2 for every cup of hot chocolate it sold and $1 for every cup of apple cider it sold. There were
375 cups of drinks sold, and the total amount of money earned from selling drinks were $400.
The system of equations shown can be used to represent the situation.
x + y = 375
2x + y = 400