# Day 5

## System of Linear Equations and using inverse matrices.

**Objectives** :

*Represent a system of linear equation as a matrix equation*

*Solve matrix equations using inverse matrices*

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## Review

An Algorithm for Computing Matrix Inverse.

We give a formula for computing the inverse 2X2 matrices.

Note : There are several algorithms for computing the inverse of a matrix if it exist. These algorithms involve a great deal of calculation,

so computing matrix inverses is usually done by computer (especially for large matrices).

## Activities & Homework

Represent a system of linear equations as a matrix equation

Use the formula to find the inverse of the following

Solve the above matrix equations