em-of-equations.html#rank-of-a-matrix"><i class="fa fa-check"></i><b>6.4.2</b> Rank of a Matrix</a></li>
<li class="chapter" data-level="6.4.3" data-path="system-of-equations.html"><a href="system-of-equations.html#invertible-matrix"><i class="fa fa-check"></i><b>6.4.3</b> Invertible Matrix</a></li>
<li class="chapter" data-level="6.4.4" data-path="system-of-equations.html"><a href="system-of-equations.html#solving-system-of-equations-using-inverse"><i class="fa fa-check"></i><b>6.4.4</b> Solving System of 