Question

Skylar is buying watermelon and pineapple for a fruit salad. Watermelon costs $0.59 per pound and pineapple costs $2.29 per pound. Skylar buys 7 pounds of fruit and spends $9.23. How much does skylar spend just on pineapple?

Answer 1

`0.59w+2.29p=9.23\\w+p=7`

Guess-and-check shows:


`(4)+(3)=7\\7=7\\\\0.59(4)+2.29(3)=9.23\\2.36+6.87=9.23\\9.23=9.23`

Skylar spent $6.87 on pineapple.