HELP WITH GEOMETRY HW>>>>WILL GIVE BRAILIEST

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 this system of equations. 12x − 18y = 27 4x − 6y = 10

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?