Variable intervals from system of inequalities

$\left(\begin{array}{cc}-1& 0\\ 1& 0\\ 0& -1\\ 1& -1\\ -2& 1\end{array}\right)\left(\begin{array}{c}i\\ j\end{array}\right)<\left(\begin{array}{c}20\\ 20\\ 10\\ 0\\ 20\end{array}\right)$

and I need to find possible intervals of i and j.

$\left(\begin{array}{cc}-1& 0\\ 1& 0\\ 0& -1\\ 1& -1\\ -2& 1\end{array}\right)\left(\begin{array}{c}i\\ j\end{array}\right)<\left(\begin{array}{c}20\\ 20\\ 10\\ 0\\ 20\end{array}\right)$

and I need to find possible intervals of i and j.