Binary Linear Word Problems: Problem 3

Problem: Lily is going to the market to buy fruits. If she buys 2 pounds of apples and 3 pounds of oranges, it costs 13 dollars; If she buys 3 pounds of apples and 5 pounds of oranges, it costs 21 dollars. How much does 1 pound of apple cost? How much does 1 pound of orange cost?

Key: Read the problem clearly and use key words to write equations out of equalities

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