Find Dy/dx by Implicit Differentiation $2 x y-y^{2}=1$ A) $\frac{x}{x-y}$ B) $\frac{x}{y-x}$ C) $\frac{y}{x-y}$

Find dy/dx by implicit differentiation.
- $2 x y-y^{2}=1$

A) $\frac{x}{x-y}$
B) $\frac{x}{y-x}$
C) $\frac{y}{x-y}$
D) $\frac{y}{y-x}$