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WAEC Mathematics 2010 Question 14

Question 14

Linear and Simultaneous Equations

The sum of 6 and one-third of x is one more than twice x. Find x.

  1. A.x = 7
  2. B.x = 5
  3. C.x = 3
  4. D.x = 2
Show the answer and explanation

Answer: C (x = 3)

Explanation

6 + x/3 = 2x + 1. Multiply by 3: 18 + x = 6x + 3, so 5x = 15 and x = 3.