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WAEC Mathematics 2021 Question 13

Question 13

Linear and Simultaneous Equations

If 4x + 2y = 16 and 6x − 2y = 4, find the value of (y − x).

  1. A.8
  2. B.2
  3. C.4
  4. D.6
Show the answer and explanation

Answer: B (2)

Explanation

Adding gives 10x = 20, so x = 2. Then 8 + 2y = 16 gives y = 4, and y − x = 2.