Let

A

$$

$=$

$$

$$

$13$

$42$

$33$

$$

$,$ b $$

$=$

$$

$$

$10$

$0$

$6$

$$

$.(2)$

Does a solution exist to the equation Ax $=$ b$?$ Use the Matlab function qr to compute a QR factorization

of A$.$ If the solution exists, using the QR factors and back substitution, compute a solution of the equation

Ax $=$ b$.$ Can you do it in Matlab?