Ch 21: ACT Math: Linear Equations

About This Chapter

Get organized for the ACT math test by revisiting linear equations. Short videos and quick quizzes motivate your math review for this portion of the ACT test.

ACT Math: Linear Equations - Chapter Summary

Linear equations with one variable are an important pre-algebra concept, and our lessons include the following topics:

  • Defining linear equations
  • Writing linear equations
  • Linear equations: intercepts, standard form and graphing
  • Defining and using a system of equations

This chapter reviews the concepts listed above, to help ensure your success on the ACT math test. The short videos present the material in a fun and engaging manner, and the quizzes give you immediate feedback to see how you're doing.

ACT Math Objectives

You can demonstrate readiness for college-level math courses through successful completion of the ACT math test. The math section contains 60 multiple-choice questions and has a 60-minute time limit. Six content areas are included:

  • Pre-Algebra
  • Elementary Algebra
  • Intermediate Algebra
  • Plane Geometry
  • Coordinate Geometry
  • Trigonometry

The questions check your reasoning skills in solving practical mathematical problems. The pre-algebra/elementary algebra part of the math test contains 24 questions. Most of the problems are distinct, but some may belong to sets of several questions. All of the problems are solvable without calculators, but you may use permitted models. Check the ACT student website for details about calculator use. Your score report for the math test includes four parts: a total test score, in addition to sub-scores in pre-algebra/elementary algebra, intermediate algebra/coordinate geometry and plane geometry/trigonometry.

6 Lessons in Chapter 21: ACT Math: Linear Equations
Test your knowledge with a 30-question chapter practice test
What is a Linear Equation?

1. What is a Linear Equation?

Most cars won't be able to run for more than 250,000 miles, so how much longer will your car live? Linear Equations are the most basic kind of algebraic function and can help you answer questions exactly like this. Learn about what they look like, how they come up in your life and why they are powerful tools.

How to Write a Linear Equation

2. How to Write a Linear Equation

Simply knowing how to take a linear equation and graph it is only half of the battle. You should also be able to come up with the equation if you're given the right information.

Linear Equations: Intercepts, Standard Form and Graphing

3. Linear Equations: Intercepts, Standard Form and Graphing

Do you know what to do if an equation doesn't look like y=mx+b?! If not, then this video is for you. Chances are the equation is in standard form, so we'll learn how to use standard form equations, how to graph them and why they can be helpful.

Problem solving using Linear Equations

4. Problem solving using Linear Equations

From sale prices to trip distances, many real life problems can be solved using linear equations. In this lesson, we'll practice translating word problems into linear equations, then solving the problems.

What is a System of Equations?

5. What is a System of Equations?

So what happens if we want to compare more than one equation? Welcome to a 'system' of equations! Learn what one is, how to solve them and when they come up in real life.

How Do I Use a System of Equations?

6. How Do I Use a System of Equations?

There are a few classic algebra word problems, such as the one about two trains traveling at different speeds. In this lesson, you'll learn how to take a word problem and convert it into the system of equations that will allow you to find the answer using either substitution or elimination.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.