Possible Duplicate:
Solution of 3 equations in 3 unknowns
$A=\left\{\begin{array}{c} u + v + 2w = 2 \\ 2u + 3v - w = 5 \\ 3u + 4v + w = c \end{array}\right.$
Possible Duplicate:
Solution of 3 equations in 3 unknowns
$A=\left\{\begin{array}{c} u + v + 2w = 2 \\ 2u + 3v - w = 5 \\ 3u + 4v + w = c \end{array}\right.$