Implicit Function Theorem. Let $\mathbf{G}\left(x,y\right)$have continuous first partial derivatives in the rectangle$\mathbf{R}\mathbf{=}\left\{\left(x,y\right):a<x<b,c<y<d\right\}$containing the pointlocalid="1664009358887" $(x_0,y_0)$. If$\mathbf{G}\left(x_0,y_0\right)\mathbf{=}\mathbf{0}$ and the partial derivative${\mathbf{G}}_{\mathbf{y}}\left(x_0,y_0\right)\mathbf{\ne }\mathbf{0}$, then there exists a differentiable function $\mathbf{y}\mathbf{=}\mathbf{\varphi }\left(x\right)$, defined in some interval$\mathbf{I}\mathbf{=}\left(x_0-\delta ,y_0+\delta \right)$,that satisfies G for allfor$\mathbf{G}\left(x,\varphi \left(x\right)\right)$all $\mathbf{x}\mathbf{\in }\mathbf{I}$.

The implicit function theorem gives conditions under which the relationship$\mathbf{G}\left(x,y\right)\mathbf{=}\mathbf{0}$ implicitly defines yas a function of x. Use the implicit function theorem to show that the relationship$\mathbf{x}\mathbf{+}\mathbf{y}\mathbf{+}{\mathbf{e}}^{\mathbf{xy}}\mathbf{=}\mathbf{0}$ given in Example 4, defines y implicitly as a function of x near the point$\left(0,-1\right)$.

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