All of the values that can go into a relation or function (input) are called the domain.
All of the values that come out of a relation or function (output) are called the range.
The domain is the set of all first elements of ordered pairs (x-coordinates).
The range is the set of all second elements of ordered pairs (y-coordinates).
Only the elements "used" by the relation or function constitute the range.
<u><em>EXAMPLE:</em></u>
<em>State the domain and range of the following relation:</em>
<em>(eye color, student's name).</em>
A = <em><u>{(blue,Steve), (green,Elaine), (brown,Kyle), (blue,Marsha), (brown,Miranda), (green, Dylan)}</u></em> State whether the relation is a function.
Solution: Domain: {blue, green, brown}.
Range: {Steve, Elaine, Marsha, Miranda, Dylan}.
No, this relation is not a function. The eye colors are repeated.
<em>sorry for the long answer. I hope i was a help!</em>
<em>like my answer!!!!</em>
