Given A $=$

$264$

$703$

$,$ b $=$

$$

$$

$11$

$0$

$5$

$$

$,$ and x $=$

x$1$

x$2$

consider the operations below. Each one of the following operations gives as result a null matrix. What is the

dimension $($rows $\backslash$times columns$)$ of this resulting null matrix?