$1)$ Determine a linearized model about each equilibrium point of the following system

Ax $+$ Bu

$2)$ Determine stability

$A=[-1\mathrm{.}4e-2,-30,-47,0$;

$1\mathrm{.}3e-4,0,1\mathrm{.}2,0$;

$-1\mathrm{.}2e-4,0,-1\mathrm{.}2,1$;

$5\mathrm{.}8e-4,0,-9,-6\mathrm{.}7e-1]$;

$B=[-0\mathrm{.}42$;$0\mathrm{.}14$;$-0\mathrm{.}14$;$-0\mathrm{.}16]$;