We are only going to focus on the 2x2 Matrix in this exercise.
As a rule of thumb, A*A^-1 = I, where A^-1 is the inverse of matrix A, and I is the identity matrix.
The Matlab code for this is again quite straightforward. For matrix A,
As a rule of thumb, A*A^-1 = I, where A^-1 is the inverse of matrix A, and I is the identity matrix.
For a 
matrix
matrix![A=[a b; c d],](http://mathworld.wolfram.com/images/equations/MatrixInverse/NumberedEquation2.gif) |
the matrix inverse is
 |  | ![1/(|A|)[d -b; -c a]](http://mathworld.wolfram.com/images/equations/MatrixInverse/Inline11.gif) | |
 |  | ![1/(ad-bc)[d -b; -c a].](http://mathworld.wolfram.com/images/equations/MatrixInverse/Inline14.gif) . |
The Matlab code for this is again quite straightforward. For matrix A,
a = inv(A)
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