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Which number-line graph represents x∈(-∞,-1]∩[-1,6)?

Answer and explanation

Correct answer: Only a closed dot at -1

The governing concept is intersection, which keeps only values common to both sets. The interval (-∞,-1] contains all numbers less than or equal to -1. The interval [-1,6) contains all numbers from -1 through values less than 6, including -1. The only common value is therefore -1 itself: numbers below -1 fail the second interval, and numbers above -1 fail the first interval. Since -1 is included in both intervals, it is represented by a closed dot. Thus option B is correct. Option A includes many values greater than -1, option C includes values not in the second interval, and option D incorrectly claims that the intersection is empty.

Related tags

Linear-InequalitiesIntersectionIntervalsRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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