![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
Observe the table:
\The ordered pair are ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8b3468668976a273fe751cee578ea2ad.png\")
.
Find the first difference of ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b1f02a70f7489dd3b8742e9e1c94d6d0.png\")
-values in the ordered pair.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=25babf5e7ae9fa1fdb4c673c8cf716bf.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=51fef01e822b5dfd1ef2fc67f09266c0.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1348a73d4ffaf134bf2e05a76338dbc2.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=088c89b21e322845e27b66c699a57bfc.png\")
Since the first differences are all equal.
\Thererefore, the table of values are represent a linear function.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The table of values are represents a linear function.