\
when
.
\
Write down the equation in if-then- form.
\
If
then
.
\
\
If
then
.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3982efa7aea364c5ecdf1ed7e61b0ec4.png\")
when ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=748d0ae03aa381cb6ba960a54c6859ba.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=748d0ae03aa381cb6ba960a54c6859ba.png\")
then ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3982efa7aea364c5ecdf1ed7e61b0ec4.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
then .