# Pre-Calculus 12: Matrices & Matrix Applications

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### Video Lectures & Study Materials

# Lecture Play Lecture
1 What is a Matrix? 1 Play Video
2 What is a Matrix? 2 Play Video
3 Row Echelon Form Play Video
4 Reduced Row Echelon Form Play Video
5 Method of Gaussian Elimination: Example Play Video
6 Method of Gaussian Elimination: 2x2 Matrix Play Video
7 Method of Gaussian Elimination: 3x3 Matrix* Play Video
8 Gaussian Elimination: 3x3 Matrix, No Solution Play Video
9 Gaussian Elimination: 3x3, Infinite Solutions Play Video
10 Gaussian Elimination: Example of Solving 3x3 Play Video
11 What are Equal Matrices? Play Video
12 How to Add Matrices Play Video
13 How to Subtract Matrices Play Video
14 How to Multiply Matrices by a Number Play Video
15 How to Solve Mixed Operations on Matrices Play Video
16 How to Multiply (Square) Matrices Play Video
17 How to Multiply (Different Size) Matrices Play Video
18 Matrices that CANNOT be Multiplied Together Play Video
19 What is an Identity Matrix? Play Video
20 What is the Inverse of a Matrix? Play Video
21 Using the Determinant to Find the Inverse Play Video
22 Using Gaussian Elimin. to Find the Inverse Play Video
23 Finding the Inverse of a 3x3 Matrix Play Video
24 Dividing One Matrix by Another Matrix Play Video
25 Solving Sys of Linear Eqn with Inverse Play Video
26 Solving Sys of Linear Eqn with Inverse Play Video
27 Solving Sys of Linear Eqn with Inverse Play Video
28 Solving Sys of Linear Eqn with Inverse Play Video
29 Find the Determinant of a 2x2 Matrix Play Video
30 Find the Determinant of a 3x3 Matrix 1 Play Video
31 Find the Determinant of a 3x3 Matrix 2 Play Video
32 Using Cramer's Rule to Find x=? y=? Play Video
33 Using Cramer's Rule to Find x=? y=? z=? Play Video