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What is the correct number-line interval for \(-2\le \frac{x+5}{3}<4\)?

Answer and explanation

Correct answer: \([-11,7)\)

Multiplying all three parts of the inequality by the positive number 3 gives \(-6\le x+5<12\). Subtracting 5 from all three parts gives \(-11\le x<7\). Therefore, \(-11\) is included, so it takes a square bracket, while \(7\) is not included, so it takes a parenthesis: \([-11,7)\). In option B, the inclusion status of both endpoints is reversed. Exam tip: In a compound inequality, track each inequality sign—\(\le\), \(<\), \(\ge\), or \(>\)—separately.

Related tags

Linear InequalitiesCompound InequalitiesInterval NotationNumber LineClass 11 MathematicsRepresentation On Number LineMathematicsClass 11 Mcq

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