Slope formulae .
(Substitute ) \ \ (Product of two same signs is positive)
(Add: )
(Subtract: )
(Divide: )
Slope is .
![\"\"](\"http://www.mathskey.com/userfiles/image/Library/slope-intercept_form_line_equation.gif\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3113839441e3480450ece8dbc4b861da.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=acced997dab660e418137a827711b7d3.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a0e0fb25b8745654c314dd097246f996.png\")
) \ \
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9ec7ebea9b71a0290ae817c623d4424e.png\")
(Product of two same signs is positive) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f3d01eb26b7a7886dfa1b73bd38f54a5.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=be8aace69a2bf1a22db2014fa70d39c6.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=82adc51a8341fa40be0e45e04a263935.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c72999ca31e29a18cc57b097f5afa853.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7a933f78bb3d427e6fb0531c2ce016a1.png\")
(Divide: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=335de4b19da19eff1e1ae36fac3d4133.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7a933f78bb3d427e6fb0531c2ce016a1.png\")
.