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JAMB Mathematics 2008 Question 32

Question 32

Coordinate Geometry

Find the gradient of the line which is perpendicular to the line with the equation 3x + 2y + 1 = 0

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

Answer: B (2/3)

Explanation

2y = −3x − 1, so the line has gradient −3/2. The perpendicular gradient is the negative reciprocal, 2/3.