f(x)=2x+2. Put in 0, 1/2, 1, 3/2, 2... and you will get integer values. That is for the domain. The numbers you get when you put that in are the range integral values.
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A relation is a mapping or pairing of input values with output values.
The Input or X values are called the Domain.
let x = any integer then (2x + 1) = any odd integer
Domain describes all possible input values.
The x-values in a set of points