How to Use a matrix for the quadratic function? Three solved problems are used to find the quadratic functions by using a matrix.

## 8-Practice problem for reduced echelon form.

Practice problem for reduced echelon form. How to determine whether the given matrix is in R echelon form or not? The second part is Application for traffic flow by matrix.

## 7b- Practice problems for Gauss Jordan elimination.

Practice problems for Gauss Jordan elimination are introduced. Step by step guide for solving these problems.

## 7a- Practice problems for back substitution.

Practice problems for back substitution for matrices. Step by step illustration of the process of back substitution.

## 7- Easy introduction to row echelon form.

Introduction to row echelon form and reduced row echelon form and their components. what is gauss- Jordan’s elimination?

## 6- Introduction to types of linear systems-Two variables.

Introduction to types of linear systems-Two variables. what are the row operations? solved problems are included.