For Problems $19,$ use the variation$-$of$-$parameters technique

to find a particular solution xp to x$=$ Ax $+$ b$,$ for the given

A and b$.$ Also obtain the general solution to the system of

differential equationsA $=$

$$

$$

$122$

$241$

$003$

$$

$,$ b $=$

$$

$$

$$e$3$t

$4$e$3$t

$3$e$3$t

$$

$$