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

Answer and explanation

Correct answer: \([-5,13)\)

Multiplying all three parts of \( -4\le \frac{x-3}{2}<5 \) by the positive number \(2\) gives \( -8\le x-3<10 \). Adding \(3\) throughout gives \( -5\le x<13 \). Thus, \(-5\) is included while \(13\) is excluded, so the interval is \(\boxed{[-5,13)}\). In option A, the inclusion of the endpoints is reversed. Exam tip: inequality signs do not reverse when multiplying or dividing by a positive number.

Related tags

Linear InequalitiesCompound InequalityInterval NotationNumber LineRepresentation On Number LineMathematicsClass 11 Mcq

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