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WAEC Mathematics 2012 Question 11

Question 11

Algebraic Expressions

Make p the subject of the relation: q = 3p/r + s/2.

  1. A.p = (2q − rs)/6
  2. B.p = 2qr − sr − 3
  3. C.p = (2qr − s)/6
  4. D.p = (2qr − rs)/6
Show the answer and explanation

Answer: D (p = (2qr − rs)/6)

Explanation

Multiply by 2r: 2qr = 6p + rs, so 6p = 2qr − rs and p = (2qr − rs)/6.