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WAEC Mathematics 2012 Question 12

Question 12

Linear and Simultaneous Equations

If x + y = 2y − x + 1 = 5, find the value of x.

  1. A.3
  2. B.2
  3. C.1
  4. D.−1
Show the answer and explanation

Answer: B (2)

Explanation

x + y = 5 and 2y − x + 1 = 5 (so 2y − x = 4). Substituting y = 5 − x: 10 − 2x − x = 4, so x = 2.