Steve buys 2 lb of grapefruit and 3 lb of oranges for $7. 20. Kennedy buys 4 lb of grapefruit and 2 lb of oranges for $8. 80. Let x represent the price per pound for grapefruit, and let y represent the price per pound for oranges. Write a system of equations to model the situation. What is the price per pound for oranges? price per pound for oranges:.