Solving simultaneous equations

Describe a system of simultaneous equations in matrix form:
 

2x1 +3 x2 +4 x3 = 2 4 x2 -2 x3 = 1  -3 x1 +2 x2 +x3 = 0

A x = L

Then use matrix algebra to get the solution:
 

x1 = x2 = x3 =

x = A-1 L

 then

>> A = [ 2 3 4; 0 4 -2; -3 2 1]

>> L = [2 1 0]'

>>  x = A \ L    (or x = inv(A) * L )