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Further Maths: The Identity Matrix

1 is the identity for multiplication and division because when we multiply or divide by 1, we end up with the same as started with.

Zero has the same effect for addition and subtraction.

A matrix comprising of all zeros except the top left to bottom right diagonal of 1s has the same effect on a matrix. This is called the Identity Matrix.

Finding the Determinant of a 2 by 2 Matrix

Find the determinant of a Matrix allows you to them find the inverse of the matrix. This is important if you have to solve simultaneous equations using matrices.

Finding the Inverse of a 2 by 2 Matrix

Find the determinent of a Matrix allows you to them find the inverse of the matrix. This is important if you have to solve simultaneous equations using matrices.

Finding the Inverse of a 2 by 2 Matrix

Example of how to find unknown elements in a matrix