Algebra & Equations · Question 6 · Medium
Solve: 2x + 3y = 23 and 3x − y = 7. What is x + y?
- 8
- 9
- 7
- 11
Answer and explanation
Answer: B. 9
Explanation: From the second equation y = 3x − 7. Substituting: 2x + 9x − 21 = 23, so x = 4 and y = 5. Hence x + y = 9.
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