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WAEC Mathematics 1993 Question 13

Question 13

Linear and Simultaneous Equations

Solve the simultaneous equations y = 3x; 4y − 5x = 14

  1. A.−2, −6
  2. B.2, 6
  3. C.2, −6
  4. D.−2, 6
  5. E.−1, −3
Show the answer and explanation

Answer: B (2, 6)

Explanation

Substitute y = 3x: 12x − 5x = 14, so 7x = 14, x = 2 and y = 6.