step 1:
\A function is a special type of relation in which each element of the domain is paired with exactly one element of the range.
\The relation is a function because the each element of the domain is paired with exactly one element![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d7b28f4ec410d4f9f1d1680b5e58a18.png\")
of the range.
Solution:
\The relation is a function.
\Domain set of the function is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9b33e307a08897943c4242885845b691.png\")
.
Range set of the function is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=20872445abbad62bfa2c52814ad2bbcc.png\")
.