% Meash Analysis
R_matrix = [ 9   -4   -2; ...
            -4   11   -5; ...
            -2   -5    8]
V_matrix = [20  0  0]'        % Colum vector
% Matrix Solution
% Ax = B
% x = inv(A) * B
% I1 = 4 A
% I2 = 2.67 A
% I3 = 2.67 A
Ix = inv(R_matrix) * V_matrix


          