How to find n in 38n4

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?

What’s the range cuz i can’t find it?

Which graph shows the solution to the system of linear inequalities? y-4t< 4 y