% To solve the system of equation a x = b, where 

a=[3 4 -1 1 -9 10;
6 5 0 7 4 -16;
1 -4 7 -1 6 -8;
2 -4 5 -6 12 -8;
-3 6 -7 8 -1 1;
8 -4 9 1 3 0];

b=[1:2:11]'; %remember which it is?

% we can use

x=a^-1*b

% or

x=a\b