(Solved): 1. Each augmented matrix below in row-reduced form is equivalent to an augmented matrix correspondi ...

1. Each augmented matrix below in row-reduced form is equivalent to an augmented matrix corresponding to a system of linear equations. Write the solution as a point. If the system is inconsistent, then state no solution. If the system is dependent, then write the solution as a point using the parameter(s) $s$ and/or $t$. (a) $\left[\begin{array}{llll}1& 0& 0& 4\\ 0& 0& 0& 1\end{array}\right]$ (b) $?\begin{array}{ccccc}1& 0& 2& ?3& 7\\ 0& 1& ?3& 4& 1\\ 0& 0& 0& 0& 0\\ 0& 0& 0& 0& 0\end{array}?$ (c) $?\begin{array}{cccc}1& 0& 0& ?4\\ 0& 1& 0& ?1\\ 0& 0& 1& 9\end{array}?$ (d) $?\begin{array}{ccccc}1& 0& 0& 0& ?2\\ 0& 1& 4& 0& ?3\\ 0& 0& 0& 1& 6\end{array}?$