make into matrix [tex] \left[\begin{array}{ccc}2&1&1\\1&-3&-1\\4&5&2\end{array}\right] = \left[\begin{array}{ccc}-2\\14\\-4\end{array}\right] [/tex]
accoring to cramer's rule replace the y collum with eh constant collumn and find the detterminant
[tex] \left[\begin{array}{ccc}2&-2&1\\1&-14&-1\\4&-4&2\end{array}\right][/tex] det [tex] 2 \left[\begin{array}{ccc}14&-1\\-4&2\end{array}\right]-(-2) \left[\begin{array}{ccc}1&-1\\4&2\end{array}\right]+1 \left[\begin{array}{ccc}1&14\\4&-4\end{array}\right]
[/tex] dunno wat fraction is
