math - How can I plot 3 equations with 3 variables in MATLAB? -

i trying plot system:

 x1   - x2 + 3x3   = 8  2x1  - x2 + 4x3  = 11  - x1 + 2x2 -4x3 = -11 

i tried ezsurf , meshgrid, wasn't able it.

clc clear close = [1 -1 3; 2 -1 4; -1 2 -4]; b = [8 11 -11]'; c = [a b]; r = rref(c); % r = %     1     0     0     1 %     0     1     0    -1 %     0     0     1     2  d = r(:,4); % salvo la 4 colonna che contiene le soluzioni  disp('le soluzioni del sistema proposto sono:'); disp(d);  figure(1); hold on grid on syms x y z  eq = x + y + 3*z - 8; z = solve(eq,z) ezsurf('8/3 - y/3 - x/3');  scatter3(d(1),d(2),d(3)); 

how can plot system of equations?

maybe i'm missing something, have 3 unknown x1, x2 , x3 3 equations, therefore there unique solution (provided determinant of matrix not zero):

>> = [1 -1 3; 2 -1 4; -1 2 -4]; >> b = [8 11 -11]'; >> x = a\b x =     1   -1    2 

so there nothing plot other single point?