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Los op: 

$ \begin{array}{l} a.\left\{ \begin{array}{l} 2x - 3y = 10 \\ - x + 6y = 6 \\ \end{array} \right. \\ b.\left\{ \begin{array}{l} 3x + 5y = 0 \\ 6y - 2x = 12 \\ \end{array} \right. \\ c.\left\{ \begin{array}{l} x + y = 1 \\ x + 2y = 100 \\ \end{array} \right. \\ \end{array} $

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