AlgebraEasyPair solving a difference and a sum
Algebra practice question
Which of the following ordered pairs (x, y) is a solution to the system x − y = 1 and x + y = 9?
- A. (5, 4)Correct
- B. (4, 5)
- C. (9, 1)
- D. (1, 9)
Answer: A. (5, 4)
5 − 4 = 1 and 5 + 4 = 9.
Why the other answers are wrong
- B. (4, 5)
- 4 − 5 is −1, not 1.
- C. (9, 1)
- 9 + 1 is 10, not 9.
- D. (1, 9)
- 1 − 9 is −8.
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