Can someone help me on number 4,5

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?

Find the axis of symmerty for x y=x squared -4x-8

Me i'm timed right now! a. (0,-5)b. (0,-3)c. (0,3) d. (0,5)