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Which points are 3 units away from 2 on the number line?

Answer and explanation

Correct answer: −1 and 5

The governing concept is absolute distance on a number line. A point x is three units away from 2 exactly when |x-2|=3. This absolute-value equation has two cases: x-2=3, giving x=5, and x-2=-3, giving x=-1. Geometrically, moving three units to the right from 2 reaches 5, while moving three units to the left reaches -1. Therefore the required points are -1 and 5, so option A is correct. Option B contains 1 and 3, each only one unit from 2. In option C, -3 is five units from 2 and 2 is zero units away. In option D, 0 is two units away and 3 is one unit away. Thus only A satisfies the distance condition for both points.

Related tags

Absolute ValueDistanceNumber LineIntegersReal NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematics

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