Oranges cost $0.50 each, and apples cost $1.00 each.
Select all the combinations of oranges and apples that Alex could buy for exactly $3.50.
2 oranges and 2 apples
3 oranges and 2 apples
1 orange and 2 apples
1 orange and 3 apples
5 oranges and 2 apples
5 oranges and 1 apples