graph the function, -(x1/2) - (3*x2 / 2) in matlab

main.m
% define the function
fun = @(x1, x2) -(x1/2) - (3*x2/2);

% create a grid of points
[x1, x2] = meshgrid(-10:.5:10);

% evaluate the function at each point on the grid
z = fun(x1, x2);

% generate the graph
surf(x1, x2, z)
xlabel('x1')
ylabel('x2')
zlabel('f(x1, x2)')
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