What is the value of 4x+3y

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian 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? i need this done

25 ! i need asap! ! ill mark brainliest!

The area of a circle is equal to 1 dm². find the radius of the circle.