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Among the following systems, which are Cramer systems? $$ (S_1): \begin{cases} 2 x + y = 1 \\ x + 3 y = 0 \end{cases}, \quad (S_2): \begin{cases} x + 2 y = 3 \\ 2 x + 4 y = 6 \end{cases}, $$ $$ (S_3): \begin{cases} x + y = 1 \\ x + 2 y = 4 \\ 2 x + 3 y = 5 \end{cases}. $$
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