Need help on matrices?
What are matrices?
These lessons on matrices include: what are matrices, operations on matrices, determinants
and inverses of matrices, using matrices to solve systems of equations, GaussJordan Method,
Row Reducing Method, Matrix Row Transformation, Cramer's Rule and using determinants to find
the area of shapes.
Matrices (singular: matrix, plural: matrices) have many uses in real life. One application would be to use matrices to represent a large amount of data in a concise manner so that we can process the data in various ways more conveniently.
For example, the sales of different types of prepacked food from 3 stalls during a given period of time could be shown in the form of a table here:
Stall A 
Stall B 
Stall C 

Packs of noodles sold 
36 
21 
43 
Packs of rice sold 
27 
56 
35 
This table can be represented as a matrix:
This matrix could then be added with another that represents the sales for a different period of time to get the total for the two periods of time, etc.