Question 82428
Since we have the identity matrix


<pre>

1 0 0 
0 1 0
0 0 1

</pre>

multiplied by matrix X we have



<pre>

|1 0 0 |
|0 1 0 | X= X
|0 0 1 |

</pre>


In other words, the identity matrix I times X is

I*X=X


So our answer is


<pre>
  |4 |
X=|-5|
  |3 |
</pre>