$\left\{\begin{matrix}P=\frac{y}{x}+\frac{3}{4}\text{, }&x\neq 0\\P\in \mathrm{C}\text{, }&x=0\text{ and }y=0\end{matrix}\right.$

$\left\{\begin{matrix}x=\frac{4y}{4P-3}\text{, }&P\neq \frac{3}{4}\\x\in \mathrm{C}\text{, }&y=0\text{ and }P=\frac{3}{4}\end{matrix}\right.$

$\left\{\begin{matrix}P=\frac{y}{x}+\frac{3}{4}\text{, }&x\neq 0\\P\in \mathrm{R}\text{, }&x=0\text{ and }y=0\end{matrix}\right.$

$\left\{\begin{matrix}x=\frac{4y}{4P-3}\text{, }&P\neq \frac{3}{4}\\x\in \mathrm{R}\text{, }&y=0\text{ and }P=\frac{3}{4}\end{matrix}\right.$