![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
The coordinates set is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6b80e9bfc495e75cd8153e3fc41c3367.png\")
.
The element ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=90a2dffa4cf28836c23bfcd658a94d29.png\")
4 in the domain is paired with two elements 1 and 5 range.
So, If x is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=90a2dffa4cf28836c23bfcd658a94d29.png\")
4, there are two possible values for y.
The relation in this coordinates set does not represent a function.
\NOTE:
\Function: A function is a relation in which each element of the domain is paired with exactly one element of the range.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
No, the relation is not a function.