Evaluate $\frac{}{}c$ for the equation $tan(7x9y)=7x$ at the given point $(0,0).$ Round your answer to two decimal places.

A $\frac{dy}{dx}=00$

B$.\frac{dy}{dx}=1\mathrm{.}00$

c$.\frac{dy}{dx}-$nea

D$.\frac{dy}{dx}=-0\mathrm{.}56$

E$.\frac{dy}{dx}=-0\mathrm{.}67$