\
Slope of the two non vertical lines is
.
\
Replace
in slope formula.
\
\
(Subtract:
)
\
(Subtract:
)
\
Slope
.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3113839441e3480450ece8dbc4b861da.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=22444ba70e4e3615643367d8aeae653c.png\")
in slope formula.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fd486479cf425c0367db024bcdb56408.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=886e97f4ec0fe06a14f4c1e4b01f6b1a.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7cf0addc3606ae5d87d40ed2df1dff5a.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f04c73eae411b371836b891523e14b01.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3a930b489383c7c14d027e098b743df6.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
.