This question is an illustration of the distance postulate.
The complete text is: Between every pair of distinct points, there is a positive unique number called the distance
Take for instance, two distinct points A and B.
The number that measures the length of A and B is called the distance between A and B.
Assume that:
The positive number (i.e. the distance) between A and B would be:
[tex]d =B - A[/tex]
[tex]d =6 - 1[/tex]
[tex]d =5[/tex]
Hence, the positive unique number is called the distance (and this is supported by the distance postulate).
Read more about distance postulate at:
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