The equation is .
(Original equation)
(Find the cross product)
Therefore, the equation can be represents direct variation.
Direct; .
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. ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1b057c176ba0ea8a70e9d3eea7065591.png\")
(Original equation) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=473cbb83a791135ccc128cd41ffefc01.png\")
(Find the cross product)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.