To each student you assign an ordered pair (n, y) in which the first element, n is a unique identifier for the student. For a class it could be a name but for a whole school it may need to be a roll number or something which is not duplicated. The second element of the ordered pair is the age.
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A pair may have various color ,but have to be the same on each shoe
10 One through each pair of vertices, and one through each pair of midpoints - of opposite sides.
There are times when there is no logic in doing so. For example, suppose you had a graph of the heights and weights of a class of students. Each data point would be an ordered pair representing the height and weight of a particular student. What, if anything, would a line connecting one student to the next represent?