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WAEC Mathematics 2015 Question 22

Question 22

Coordinate Geometry

The table shows some values for a linear graph.
x: 0, 1¼, 2, 4
y: 3, 5½, __, __
What is the value of y when x = 2?

  1. A.5
  2. B.7
  3. C.9
  4. D.11
Show the answer and explanation

Answer: B (7)

Explanation

The line has gradient 2 and y-intercept 3, so y = 2x + 3 and at x = 2, y = 7.