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JAMB Mathematics 1982 Question 11

Question 11

Coordinate Geometry

Which of the following lines is not parallel to the line 3y + 2x + 7 = 0?

  1. A.3y + 2x − 7 = 0
  2. B.9y + 6x + 17 = 0
  3. C.24y + 16x + 19 = 0
  4. D.3y − 2x + 7 = 0
  5. E.15y + 10x − 13 = 0.
Show the answer and explanation

Answer: D (3y − 2x + 7 = 0)

Explanation

Parallel lines have the same ratio of x to y coefficients (2 : 3). All options keep 2 : 3 except 3y − 2x + 7 = 0, whose gradient is +2/3 instead of −2/3.