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WAEC Mathematics 2020 Question 20

Question 20

Coordinate Geometry

Find the equation of the line parallel to 2y = 3(x − 2) and passes through the point (2, 3).

  1. A.y = (3/2)x − 3
  2. B.y = (2/3)x − 2
  3. C.y = (3/2)x
  4. D.y = (−2/3)x
Show the answer and explanation

Answer: C (y = (3/2)x)

Explanation

2y = 3x − 6 has gradient 3/2. Through (2, 3): y − 3 = (3/2)(x − 2), so y = (3/2)x.