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Which number-line representation is correct for −4 ≤ x < 2?

Answer and explanation

Correct answer: Closed circle at −4 and open circle at 2

The endpoint symbols in an inequality determine whether the endpoint belongs to the solution set. The symbol ≤ includes equality, so x = −4 is allowed and −4 must be shown by a closed, filled circle. The symbol < excludes equality, so x = 2 is not allowed and 2 must be shown by an open, unfilled circle. Every value between −4 and 2 is included, so the interval is [−4, 2), with the segment between the endpoints shaded. Therefore option B is correct. Option A reverses the meanings of the two signs, option C excludes both endpoints, and option D includes both endpoints. The governing idea is closed for inclusive and open for strict inequalities.

Related tags

Linear InequalitiesNumber LineInterval NotationEndpoint SymbolsRepresentation On Number LineMathematicsClass 11 Mcq

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