![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Identification of function: A function is a relation in which each element of the domain is paired with exactly one element of the range.
\Observe the relation as the graph, the relation is not a function. Observe the coordinate pairs in the graph, the element 4 in the domain is paired with both ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2f92bad238a206d14c40c62843c1a3a5.png\")
in the range. So, when x - coordinate value 4 there is more than one possible value for y. ![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
No, the relation is not a function.