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WAEC Mathematics 2019 Question 17

Question 17

Linear and Simultaneous Equations

If 3p = 4q and 9p = 8q − 12, find the value of pq.

  1. A.12
  2. B.7
  3. C.−7
  4. D.−12
Show the answer and explanation

Answer: A (12)

Explanation

8q = 2(4q) = 6p, so 9p = 6p − 12, giving p = −4. Then q = 3p/4 = −3, and pq = 12.