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What about the partial derivative with respect to z?

there are two methods to working this? You can find it also and by finding the z

How do you solve simultaneously when we habe xz i the first eqn and yz in the second?

but we have λ in both

Yes, and...

lol

λ- (y+2z/yz)=0 equation 1
λ- (x+2z/xz)=0 equation 2

or you could solve by letting λ= λ

Disclaimer, this is how I would attempt this question based on how i was taught

Haha! I'm only kidding!

do u agree or not?

I'll quickly give it a go and see what I get...

well its not quiet... clear so I need to get help