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WAEC Mathematics 2020 Question 42

Question 42

Coordinate Geometry

The points on a linear graph are as shown in the table. Find the gradient (slope) of the line.
x: 6.20, 6.85, 7.50
y: 3.90, 5.20, 6.50

  1. A.2½
  2. B.2
  3. C.1
  4. D.½
Show the answer and explanation

Answer: B (2)

Explanation

Gradient = change in y ÷ change in x = (5.20 − 3.90)/(6.85 − 6.20) = 1.30/0.65 = 2.