1. How to find the inverse of a matrix
Inverse Matrices (3 x 3)
How to find the inverse of a matrix

2. The minor determinant
The minor determinant that corresponds to an element is given by deleting the row and column of the element.

3. The minor determinant
The minor determinant that corresponds to an element is given by deleting the row and column of the element.
The minor determinant corresponding to the 5 is 11.

4. The minor determinant
The minor determinant that corresponds to an element is given by deleting the row and column of the element.
The minor determinant corresponding to the -3 is 2.

5. The minor determinant
The minor determinant that corresponds to an element is given by deleting the row and column of the element.
The minor determinant corresponding to the 8 is 7.

6. Finding Inverses 3x3
An algorithm can be followed to find the inverse of a 3x3 matrix, M.
Find the matrix of minor determinants.
Alter the signs of the minors which don’t lie on the diagonals.
Transpose
Divide by det(M)

7. Finding Inverses 3x3 (Example)
Make sure non-singular.
Find the matrix of minor determinants.
Alter the signs of the minors which don’t lie on the diagonals.
Transpose
Divide by det(M)