#6 is killing me. or im just doing something wrong

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !