Which of the following pairs of linear equations has unique solution, no solution, or infinitely...

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Which of the following pairs of linear equations has unique solution, no solution, or infinitely many solutions. In case there is a unique solution, find it by using cross multiplication method.
(i) \( x-3 y-3=0 \)
(ii) \( 2 x+y=5 \)
\( 3 x-9 y-2=0 \)
\( 3 x+2 y=8 \)
(iii)
\[
\begin{array}{l}
3 x-5 y=20 \\
6 x-10 y=40
\end{array}
\]
(iv) \( x-3 y-7=0 \)
\[
3 x-3 y-15=0
\]
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