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WAEC Mathematics 2018 Question 22

Question 22

Coordinate Geometry

The equation of the line through the points (4, 2) and (−8, −2) is 3y = px + q, where p and q are constants. Find the value of p.

  1. A.1
  2. B.2
  3. C.3
  4. D.9
Show the answer and explanation

Answer: A (1)

Explanation

Gradient = (−2 − 2)/(−8 − 4) = 1/3. Writing y = x/3 + c as 3y = x + 3c gives p = 1.