Write the function in the form $y=f(u)$ and $u=g(x).$ Then find $\frac{dy}{dx}$ as a function of $x.$

$y=e^{5-7x}$

Choose the correct form of $y$ in terms of $u.$

A$.y=e^u,$ where $u=5-7x$

B$.y=e^{-5+7u},$ where $u=-x$

C$.y=e^{ux},$ where $u=5-7$

D$.y=u^{5-7x},$ where $u=e$

$\frac{dy}{dx}=-\frac{1}{7}ln(x)+\frac{5}{7}$

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