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WAEC Mathematics 2010 Question 40

Question 40

Coordinate Geometry

The table is for the relation y = mx + c where m and c are constants.
x: 0, 2, 4, 6
y: 1, 2, 3, 4
What is the value of x when y = 5?

  1. A.8
  2. B.9
  3. C.10
  4. D.11
Show the answer and explanation

Answer: A (8)

Explanation

5 = ½x + 1, so ½x = 4 and x = 8.