WAEC Mathematics 2014 Objective — Question 7

Question 7 of 50 from the West African Examinations Council (WAEC) Mathematics 2014 Objective paper, with the correct answer and a full explanation.

Which of the following number lines represents the solution to the inequality: −9 ≤ (2/3)x − 7 < 5?

• A. Number line A
• B. Number line B
• C. Number line C
• D. Number line DCorrect

Explanation

Solving: −9≤(2/3)x−7<5 gives −2≤(2/3)x<12, so −3≤x<18. This is represented by a number line with a closed circle at −3 and an open circle at 18.

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