$$\left. \begin{array} { l } { a _ { 1 } x + b _ { 1 } y + c _ { 0 } = 0 y _ { 2 } x + b _ { 2 } = 0 } \\ { 2 } \\ { \frac { a _ { 1 } } { a _ { 2 } } = \frac { b _ \right.$$
$\left\{\begin{matrix}x=-\frac{b_{1}y+c_{0}-b_{2}}{a_{1}}\text{, }&a_{1}\neq 0\\x\in \mathrm{C}\text{, }&b_{2}=b_{1}y+c_{0}\text{ and }a_{1}=0\end{matrix}\right.$
$\left\{\begin{matrix}x=-\frac{b_{1}y+c_{0}-b_{2}}{a_{1}}\text{, }&a_{1}\neq 0\\x\in \mathrm{R}\text{, }&b_{2}=b_{1}y+c_{0}\text{ and }a_{1}=0\end{matrix}\right.$
