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WAEC Mathematics 2012 Question 10

Question 10

Inequalities

Represent the inequality −7 < 4x + 9 ≤ 13 on a number line.

Diagram for this question
  1. A.Diagram A
  2. B.Diagram B
  3. C.Diagram C
  4. D.Diagram D
Show the answer and explanation

Answer: B (Diagram B)

Explanation

Subtract 9: −16 < 4x ≤ 4, so −4 < x ≤ 1. That is an open circle at −4 and a filled dot at 1, as in B.