function is: a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output. itis an equation that has only one answer for y for every x. it assigns exactly one output to each input of a specified type. It is common to name a function either f(x) or g(x) instead of y. f(5) means that we should find the value of our function when x equals 5.
It is usually represented by a function rule where you express the dependent variable, y in terms of the independent variable, x. A pair of an input value and its corresponding output value is called an ordered pair and can be written as (c, d).
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