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Two distinct points A and B on a number line have coordinates \(a\) and \(b\), respectively. Under which condition will the origin be the midpoint of these two points?

Answer and explanation

Correct answer: \(a+b=0\)

The midpoint coordinate is \(\frac{a+b}{2}\). For it to be the origin, \(\frac{a+b}{2}=0\), so \(a+b=0\). In contrast, \(a-b=0\) gives the same coordinate for both points. Exam tip: use the average of coordinates for a midpoint.

Related tags

Number LineMidpointCoordinatesReal NumbersNumber SystemsMathematicsClass 9 Mcq

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