Ordered pairs are used for many things. Anytime you graph a point on a cartesian coordinate system, you have an ordered pair. In fact, all of R^2 is made up of ordered pairs. When you put a value in a function and get one out, you have an ordered pair
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May be called the ordinates.
i.e
pairs
The domain is the set of the first number of each ordered pair and the range is the set of the second number.
It is the change in the second element of the two pairs divided by the change in the corresponding first elements.So, if the two pairs are (p, q) and (r, s), the rate of change is(q - s)/(p - r) or, equivalently (s - q)/(r - p). It does not matter which of the two pairs goes first but the same order must be used for the numerator and the denominator - that is why the word "corresponding" was used above.