A) \[x=3,y=1\]
B) \[x=1,y=3\]
C) \[x=0,\text{ y}=3\]
D) \[x=0,\text{ }y=0\]
Correct Answer: D
Solution :
\[x+iy=\left| \begin{matrix} 6i & -3i & 1 \\ 4 & 3i & -1 \\ 20 & 3 & i \\ \end{matrix} \right|\] \[x+iy=3i\left| \begin{matrix} 6i & 1 & 1 \\ 4 & -1 & -1 \\ 20 & i & i \\ \end{matrix} \right|=0\] \[\Rightarrow \] \[x+iy=0\] \[\Rightarrow \] \[x=0,y=0\]
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