Q$\_$lung $=2$;

Q$\_$liver $=0\mathrm{.}5$;

Q$\_$ot $=1\mathrm{.}5$;

R $=0\mathrm{.}60$;

C$\_$in $=375$;

V$\_$max$\_$lung $=8\mathrm{.}5$;

V$\_$max$\_$liver $=123$;

V$\_$lung $=0\mathrm{.}08$;

V$\_$liver $=0\mathrm{.}322$;

A $=[$Q$\_$lung $-$ R$*($Q$\_$liver $+$ Q$\_$ot$),0$;

Q$\_$liver, $-$Q$\_$liver$]$;

b $=[$V$\_$max$\_$lung $*$ V$\_$lung $-(1-$ R$)*$ Q$\_$lung $*$ C$\_$in;

V$\_$max$\_$liver $*$ V$\_$liver$]$;

x $=$ A $\backslash$ b;

C$\_$lung $=$ x$(1)$;

C$\_$liver $=$ x$(2)$;

disp$([\text{'}$Concentration in the lung compartment: $\text{'},$ num$2$str$($C$\_$lung$),\text{'}$M$\text{'}])$;

disp$([\text{'}$Concentration in the liver compartment: $\text{'},$ num$2$str$($C$\_$liver$),\text{'}$M$\text{'}])$;

i have the vector b correct but it tells me that my matrix is wrong.