Can someone help me plzzz

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?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Bob paid $3 less than tim at a local pizza parlor. together they spent $7.80. how much did bob pay for pizza?