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WAEC Mathematics 1995 Question 19

Question 19

Linear and Simultaneous Equations

Solve the following simultaneous equations: x + y = 3/2; x − y = 5/2 and use your result to find the value of 2y + x

  1. A.−2
  2. B.−1
  3. C.½
  4. D.1
  5. E.3½
Show the answer and explanation

Answer: D (1)

Explanation

Adding the equations gives 2x = 4, so x = 2 and y = −½. Then 2y + x = −1 + 2 = 1.