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Which number line representation shows (x>2)?

Answer and explanation

Correct answer: Open circle at (2) and shading to the right

The direct answer is A: an open circle at 2 with shading to the right. The sign “>” means values greater than 2. The number 2 itself is excluded, because the statement is not “greater than or equal to.” Therefore the circle at 2 must be open. Numbers greater than 2 lie to the right on a number line, so the ray or shading goes right. A shows both facts correctly. B has the correct direction but a closed circle, which would represent x≥2 and incorrectly include 2. C has an open circle, correctly excluding 2, but shades left; that represents x<2. D shades left and uses a closed circle, representing x≤2. A reliable method is to ask two questions: is the endpoint included, and in which direction are the allowed numbers? For “>”, use an open circle and right shading. Memory cue: greater goes right; strict signs use an open circle.

Related tags

Linear InequalitiesIntroductionClass 11

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