Selectividad Andalucía 2001-6-A3

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Determina a , b y c sabiendo que la matriz
A = \left( \begin{array}{ccc} -3 & 1 & 1 \\ 1 & a & 2 \\ -1 & b & c \end{array} \right) verifica A \cdot \left( \begin{array}{c} 1 \\ 2 \\ 3 \end{array} \right) = \left( \begin{array}{c} 2 \\ 9 \\ 4 \end{array} \right) y rango(A) = 2