Without using the concept of inverse of a matrix, find the matrix \...

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Without using the concept of inverse of a matrix, find the matrix \( \left[\begin{array}{ll}x & y \\ z & u\end{array}\right] \) such that
\[
\left[\begin{array}{rr}
5 & -7 \\
-2 & 3
\end{array}\right]\left[\begin{array}{ll}
x & y \\
z & u
\end{array}\right]=\left[\begin{array}{rr}
-16 & -6 \\
7 & 2
\end{array}\right] \text {. }
\]
\( \mathrm{P} \)
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