$(20$ points$)$ Consider matrix A$=$

$$

$$

$352$

$140$

$111$

$$

$.$

$($a$)$ Calculate A

$1$

$.$

$1$

$($b$)$ Consider the system of yA$=$ d

$$ where y is an unknown $1\backslash$times $3$ vector, vector

d$=$

$$

$$

$7$

$4$

$10$

$$

$$ and A is the same as above. Find y$.$