Did you intend to do an element-by-element multiply on X and Y?
close all
x = -1 : 0.1 : 5;
y = x;
[X, Y] = meshgrid(x,y);
Z = 2*X - X.*Y + 2*Y; % Note the .*
surf(X, Y, Z)
xlabel('Ox')
ylabel('Oy')
zlabel('Oz')
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