SOLUTION: Find the inverse(if it exists) 1 0 1 1 1 -3 0 1 -3 i don't know how to solve a 3x3 if you can please explain

Question 126342: Find the inverse(if it exists)
1 0 1
1 1 -3
0 1 -3
i don't know how to solve a 3x3 if you can please explain
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
For an n X n matrix, create an n X 2n matrix by adding n columns consisting of the n X n identity matrix.

Your problem:

The 3 X 3 Identity matrix:

Putting them together in a 3 X 6 matrix:

Now, perform row reduction operations until the matrix is completely reduced, if possible.

Hence:

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