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y = 2x + 3 is a function rule. This rule can also be written in several different ways:

f(x) = 2x + 3 "f of x equals ...', or f: x -> 2x+3 "f maps x as ...".

As a set of ordered pairs. Here is a set of pairs which satisfy our function, f: {(1,5), (2,7), (3, 9), (4, 11)}.

A table of values, also known as a 'T chart'.

A mapping diagram,, which has two oval shapes with numbers in them, and arrows joining the numbers in one oval to the numbers in the other oval.

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