Find \( k \) for which system \( \mathrm{P} \) \[ \begin{array}{l} ...

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Find \( k \) for which system
\( \mathrm{P} \)
\[
\begin{array}{l}
k x-y+2 z=3 \\
x+2 y-3 z=7 \\
3 x+4 y-9 z=1
\end{array}
\]
W
is having unique solutions
(1) \( k \neq \frac{-2}{3} \)
(2) \( k=\frac{2}{3} \)
(3) \( k=\frac{1}{3} \)
(4) \( k \neq \frac{-1}{3} \)
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