Find the probability of selecting the same card from a deck of playing cards twice with replacement

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

X+y=-4 x-y=2 use elimination with adding and subtraction

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?