If point A has coordinate −3 and point B has coordinate 1 on the number line, what is the distance between A and B?
Answer and explanation
Correct answer: 4 units
The distance between two points on a number line is the absolute value of the difference of their coordinates. Thus, distance = |1 − (−3)| = |4| = 4 units. The answer is not 2 units because the points lie four unit intervals apart. In exams, use brackets when subtracting a negative number.
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What is the correct answer to this question?
4 units
Why is this the correct answer?
The distance between two points on a number line is the absolute value of the difference of their coordinates. Thus, distance = |1 − (−3)| = |4| = 4 units. The answer is not 2 units because the points lie four unit intervals apart. In exams, use brackets when subtracting a negative number.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Polynomials. Topic: Representing real numbers on the number line.
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