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JAMB Mathematics 2007 Question 47

Question 47

Coordinate Geometry

What is the value of k if the mid-point of the line joining (1 − k, −4) and (2, k + 1) is (−k, k)?

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

Answer: A (−3)

Explanation

x: (3 − k)/2 = −k gives k = −3. y: (k − 3)/2 = k also gives k = −3.