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Ch 19: ACT Math: Matrices

About This Chapter

Get ready to shine on the math section of the ACT college admissions test. Use our entertaining video lessons and quick quizzes to review crucial algebraic concepts.

ACT Math: Matrices - Chapter Summary

Matrices are a fundamental aspect of the linear algebra branch of math. In this chapter, review the following basic information through our motivating videos:

  • Definition of matrix
  • How and why matrices are used
  • Parts of a matrix: rows, columns and brackets
  • Adding, subtracting and multiplying matrices
  • Taking determinants of matrices

Go over all of the information about matrices so that you can demonstrate proficiency on the ACT math test. View concise examples of matrices in the lessons, and take the follow-up quizzes to see how you're doing.

ACT Math Objectives

The ACT test speaks to the three mathematical areas of algebra, geometry and trigonometry. The exam considers algebra as three levels: pre-, elementary and intermediate. Overall, the algebra section involves 55% of the 60-question test. Our review lessons, followed by self-assessment quizzes, will help you revisit the key concepts necessary for the ACT. The test's pre-algebra questions assume a base built upon an understanding of fundamental linear algebra skills. The exam then checks for more in-depth understanding of the intermediate skills directly related to matrices.

You'll have 60 minutes to complete 60 multiple-choice math problems. You can complete all of the questions without the use of calculators. However, you'll be able to use certain approved models of calculators, if you wish to do so. Check with the ACT student site for details concerning calculator use.

Your score report will include four scores for the math portion of the test: an overall score on all 60 questions and sub-scores for pre-algebra/elementary algebra, intermediate algebra/coordinate geometry and plane geometry/trigonometry.

11 Lessons in Chapter 19: ACT Math: Matrices
Test your knowledge with a 30-question chapter practice test
What is a Matrix?

1. What is a Matrix?

As math gets more and more complicated and there become more and more numbers flying around, it becomes really handy to put all these numbers in a nice organized grid... hello matrices! Learn about what they are and why there are used.

How to Write an Augmented Matrix for a Linear System

2. How to Write an Augmented Matrix for a Linear System

Watch this video lesson to learn how you can turn your system of equations into matrix form. The matrix form is another way of writing your linear system that is sometimes easier to work with.

How to Perform Matrix Row Operations

3. How to Perform Matrix Row Operations

Watch this video lesson to learn how easy it is to perform row operations on a matrix. Learn how to perform the three basic operations easily and quickly.

Matrix Notation, Equal Matrices & Math Operations with Matrices

4. Matrix Notation, Equal Matrices & Math Operations with Matrices

Watch this video lesson to learn about the basics of matrices and what kinds of math operations you can do with them. Also learn how to determine whether two matrices are the same or not.

How to Solve Inverse Matrices

5. How to Solve Inverse Matrices

Watch this video lesson to learn what kinds of matrix operations you can take to find the inverse of a matrix. Also learn why matrix inverses are useful.

How to Solve Linear Systems Using Gaussian Elimination

6. How to Solve Linear Systems Using Gaussian Elimination

Watch this video lesson to learn an easy way to solve a system of equations that involves manipulating a matrix. Learn the kinds of easy matrix manipulations that are needed to solve any system of equations.

How to Solve Linear Systems Using Gauss-Jordan Elimination

7. How to Solve Linear Systems Using Gauss-Jordan Elimination

You will come across simple linear systems and more complex ones as you progress in math. Watch this video lesson to learn how you can use Gauss-Jordan elimination to help you solve these linear systems.

Inconsistent and Dependent Systems: Using Gaussian Elimination

8. Inconsistent and Dependent Systems: Using Gaussian Elimination

Watch this video lesson to learn whether or not you can use Gaussian elimination to solve inconsistent and dependent systems. Also, learn whether there is another way to find solutions of these systems.

Multiplicative Inverses of Matrices and Matrix Equations

9. Multiplicative Inverses of Matrices and Matrix Equations

Watch this video lesson to learn about another method you can use to solve a matrix problem if you are given the inverse of the matrix. You will also learn the identifying mark of the multiplicative inverse of a matrix.

Performing Operations on Vectors in the Plane

10. Performing Operations on Vectors in the Plane

After watching this video lesson, you should be able to add, subtract, and multiply your vectors. Learn how easy it is to perform these operations and what you need to keep in mind when performing these operations.

Scalar Multiplication of Vectors: Definition & Calculations

11. Scalar Multiplication of Vectors: Definition & Calculations

After watching this video, you will be able to explain what scalar multiplication is and complete basic calculations involving the scalar multiplication of vectors. A short quiz will follow.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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