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3 ; Find the product AB where A = $\left[\begin{array}{ccc}1& -1& 0\\ 2& 3& 4\\ 0& 1& 2\end{array}\right]\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}$ , B = $\left[\begin{array}{ccc}2& 2& -4\\ -4& 2& -4\\ 2& -1& 5\end{array}\right]$

and use it to solve the equations x-y = 3 , 2x +3y +4z = 17 , y + 2z = 7

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