Systems word problems: sum and difference
Write two equations for the two unknown numbers, then solve the system.
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Two numbers have a sum of 10 and a difference of 4. What are the numbers? Write the larger first, like (9, 4).
Answer: (7, 3)
Two numbers have a sum of 18 and a difference of 6. What are the numbers? Write the larger first, like (9, 4).
Answer: (12, 6)
Two numbers have a sum of 29 and a difference of 11. What are the numbers? Write the larger first, like (9, 4).
Answer: (20, 9)
Tip: Write two equations for the two unknown numbers, then solve the system.
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