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

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Find \( k \) for which system
\( \mathrm{P} \)
\[
\begin{array}{l}
2 x+3 k y=-1 \\
5 x+4 y=7
\end{array}
\]
W
is having unique solutions
(1) \( k \neq \frac{8}{15} \)
(2) \( k=\frac{8}{15} \)
(3) \( k \neq \frac{2}{15} \)
(4) \( k=\frac{2}{15} \)
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