- Ordered pair
An ordered pair is a set of two elements mentioned in that order, the elements being
written within parentheses. In analytical geometry, the x-coordinate and the
y-coordinate together are enclosed within the parentheses and separated by a comma.
Note that every point in the plane is represented as an ordered pair of real numbers.
Also, the elements of an ordered pair are not interchangeable, that is ordered pairs
(a, b) and (b, a) are not one and the same.
The idea of ordered pair may also be taught with the same embossed diagram depicting
the rectangular coordinate system.
