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# Differentiation Help in calculus?

Find y'' (y double prime) for

9x^2 + y^2=9

Please help.

Update:

I know the derivative of the first one is y'= -8x/y , but what is the derivative of y'= -8x/y?

### 1 Answer

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- confusciousLv 41 decade agoFavorite Answer
= 18x + 2y*dy/dx=0

= 2y*dy/dx= -18x

= dy/dx= -18x/2y

I think that's right.. I've had some trouble with differentiation but this is a pretty simple differentiation problem.

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