\left\{ \begin{array} { l } { B y + C ( z + 2 ) = 0 } \\ { B ( y - 1 ) + C ( z - 7 ) = 0 } \end{array} \right.
Solve for B, y, C, z (complex solution)
y\in \mathrm{C}\text{, }z\in \mathrm{C}\text{, }B=0\text{, }C=0
y=0\text{, }z=-2\text{, }B=-9C\text{, }C\in \mathrm{C}
y=\frac{z+2}{9}\text{, }z\neq -2\text{, }B=-\frac{C\left(z+2\right)}{y}\text{, }C\in \mathrm{C}
Solve for B, y, C, z
y\in \mathrm{R}\text{, }z\in \mathrm{R}\text{, }B=0\text{, }C=0
y=0\text{, }z=-2\text{, }B=-9C\text{, }C\in \mathrm{R}
y=\frac{z+2}{9}\text{, }z\neq -2\text{, }B=-\frac{C\left(z+2\right)}{y}\text{, }C\in \mathrm{R}
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