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Which interval is correct for the number line representation of \(2<3x-1\le 11\)?

Answer and explanation

Correct answer: \((1,4]\)

Adding 1 to all parts of \(2<3x-1\le 11\) gives \(3<3x\le 12\). Dividing all parts by 3 gives \(1<x\le 4\). Thus, 1 is not included whereas 4 is included, so the correct interval is \((1,4]\). Option B incorrectly includes 1. Exam tip: use parentheses \((\ )\) for an excluded endpoint and square brackets \([\ ]\) for an included endpoint.

Related tags

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

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