AlgebraEasy–MediumSolution of a simple system
Algebra practice question
Which ordered pair (x, y) satisfies both 2x + y = 15 and x − y = 3?
- A. (6, 3)Correct
- B. (3, 6)
- C. (5, 5)
- D. (9, 6)
Answer: A. (6, 3)
Adding the equations gives 3x = 18, x = 6, y = 3.
Why the other answers are wrong
- B. (3, 6)
- (3, 6): 3 − 6 = −3.
- C. (5, 5)
- (5, 5): 5 − 5 = 0.
- D. (9, 6)
- (9, 6): 18 + 6 = 24.
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