The equation is .
The standard form of linear function is .
The equation includes the square variable.
is not a linear function.
No;
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4cb9b24e0a96a19e2842c65c75725216.png\")
. is not a linear function.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")