\left\{ \begin{array} { l } { a _ { 1 } + b d = 9 } \\ { d _ { 1 } + 7 d = 1 } \end{array} \right.
Solve for a_1, b, d, d_1 (complex solution)
a_{1}=9-bd
b\in \mathrm{C}
d\in \mathrm{C}
d_{1}=1-7d
Solve for a_1, b, d, d_1
a_{1}=9-bd
b\in \mathrm{R}
d\in \mathrm{R}
d_{1}=1-7d
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