![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Pairs of points ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6bd0f8b083e63a43c623da22e313a312.png\")
Plot the order of pairs.
\![\"\"](\"/userfiles/image/Library/Algebra%202/number%20line%20pa_70%20pr_61_1.gif\")
The relation is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6bd0f8b083e63a43c623da22e313a312.png\")
The domain of the relation is the set of all first (x-coordinates) coordinates.
\The domain of the relation is: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2dadcb99506e925d75ddca97af295ec3.png\")
The range of the relation is the set of second (y-coordinates) coordinates.
\The range of the relation is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=af46ab5caca8d8c1172dd5e588acfe3a.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Draw the vertical lines through the points. Observe that there is no
\vertical line contains more than one of the points.
\This graph passes the vertical line test.
\![\"\"](\"/userfiles/image/Library/Algebra%202/Number%20line%20pa_70%20pr_61_2.gif\")
Each element of the domain is paired with exactly one element of the range.
\Therefore the relation is a function and this one-to-one function.
\The graph consists of points that are not connected. So the relation is discrete.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
Yes, the relation is a function and discrete.
\