The equation is .
Rewrite the equation is .
Since, varies directly as and .
Find the which type of variation.
The quotients of represent constant value, then it represents the joint variation.
The equation represents the joint variation.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=752d622164dcfd6632f7e9b08b03ccca.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a5470359cce5bdc4f9da3ff6625792d1.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=52257f1605fb2b790995dd69987af2c6.png\")
varies directly as ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b72515eceac9b0f2954ec68f910b8672.png\")
and ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=397fa06c87524875a08b8582b661eb47.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6526aa1766af7672dc1e6020508254da.png\")
represent constant value, then it represents the joint variation.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")