Evaluate (complex solution)
y-5x=stx-y\text{ and }stx-y=-2
Solve for x
\left\{\begin{matrix}x=\frac{4}{5}=0.8\text{, }&y=2\text{ and }\left(s=0\text{ or }t=0\right)\\x=\frac{2y}{st+5}\text{, }&y=-\frac{2\left(st+5\right)}{st-5}\text{ and }t\neq 0\text{ and }s\neq 0\text{ and }|s|\neq \frac{5}{|t|}\\x=\frac{2}{5}=0.4\text{, }&y=0\text{ and }s=-\frac{5}{t}\text{ and }t\neq 0\end{matrix}\right.
Solve for y
\left\{\begin{matrix}y=-\frac{2\left(st+5\right)}{st-5}\text{, }&x=\frac{4}{5-st}\text{ and }t\neq 0\text{ and }s\neq \frac{5}{t}\\y=2\text{, }&x=\frac{4}{5}\text{ and }t=0\end{matrix}\right.
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