I'm given F(x*y;z/x), where z=z(x,y).(adsbygoogle = window.adsbygoogle || []).push({});

I have to proof that (∂z/∂x)*x+(∂z/∂y)*y=3*z

I have expressed all partial derivatives, but I got only (∂z/∂x)*x-(∂z/∂y)*y=z

I think that it's impossible at all to solve this problem, because z is arbitrary function as i understand.

Help me please. Where I'm wrong?

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# Homework Help: Expressed all partial derivatives

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