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JAMB Mathematics 1984 Question 20

Question 20

Linear and Simultaneous Equations

If 2x + 3y = 1 and x − 2y = 11, find (x + y)

  1. A.5
  2. B.−3
  3. C.8
  4. D.2
  5. E.−2.
Show the answer and explanation

Answer: D (2)

Explanation

From the second equation x = 11 + 2y. Then 22 + 4y + 3y = 1, so y = −3 and x = 5. x + y = 2.