Substitute in slope formula.
(Apply additive identity property: )
The slope of the line that passes through the points is . \ \
![\"slope](\"/userfiles/image/Library/slope_of_a_line.gif\")
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1968fca53b36ed98a2e5da5819203e13.png\")
in slope formula.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=90df205017e59946aac04db620f24548.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=53b356cd7834f97a741845157b53a994.png\")
(Apply additive identity property: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5242d76335a8af4b5a493d4752c5108a.png\")
) ![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bfca901f01f177566d12bdfb911dc0e6.png\")
. \ \