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WAEC Mathematics 1991 (August) Question 13

Question 13

Linear and Simultaneous Equations

If 2x + y = 7 and 3x − 2y = 3, by how much is 7x greater than 10?

  1. A.1
  2. B.3
  3. C.7
  4. D.10
  5. E.17
Show the answer and explanation

Answer: C (7)

Explanation

Double the first equation: 4x + 2y = 14. Add the second: 7x = 17, which is 7 more than 10.