Check out example codes for "matlab matrix inverse". It will help you in understanding the concepts better.

Code Example 1

% To get the inverse of a matrix use inv()

X = [1 0 2; -1 5 0; 0 3 -9]
% 1     0     2
% -1    5     0
% 0     3    -9

Y = inv(X)
% 0.8824   -0.1176    0.1961
% 0.1765    0.1765    0.0392
% 0.0588    0.0588   -0.0980

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