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Which representation correctly shows x ∈ ℝ on the number line?

Answer and explanation

Correct answer: The entire number line is shaded

The governing concept is the meaning of the set of real numbers, denoted by ℝ. Every point on the ordinary number line corresponds to a real number, including negative numbers, zero, and positive numbers. Therefore, the statement x ∈ ℝ places no further restriction on x: every real value is allowed. Its solution set is the whole real line, written in interval notation as (-∞, ∞). A correct number-line representation must consequently shade the complete line. Option B represents only x > 0, option C represents only x < 0, and option D represents the singleton set {0}. Since none of those options contains all real numbers, option A is the only correct representation.

Related tags

Linear-InequalitiesReal-NumbersNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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