Ineed to find b and angle a and angle b and the area

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

Write an equation in point-slope form for the line through the given point that has the given slope (-2,-7); m=-3/2

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps