Art of Problem Solving
AoPS Online AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
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Books for Grades 5-12 Online Courses
Beast Academy Beast Academy
Engaging math books and online learning
for students ages 6-13.
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Books for Ages 6-13 Beast Academy Online
AoPS Academy AoPS Academy
Small live classes for advanced math
and language arts learners in grades 1-12.
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The time is now - Spring classes are filling up!
AOPS CURRICULUM
Introduction Series
Prealgebra Intro to Algebra Intro to Counting & Probability Intro to Geometry Intro to Number Theory
Intermediate / Advanced
Intermediate Algebra Intermediate Counting & Probability Precalculus Calculus
Competition Preparation
AoPS Volume 1 AoPS Volume 2 Competition Math
BEAST ACADEMY
Math
Level 1
Beast Academy 1A Beast Academy 1B Beast Academy 1C Beast Academy 1D Beast Academy 1 Puzzles
Level 2
Beast Academy 2A Beast Academy 2B Beast Academy 2C Beast Academy 2D Beast Academy 2 Puzzles
Level 3
Beast Academy 3A Beast Academy 3B Beast Academy 3C Beast Academy 3D Beast Academy 3 Puzzles
Level 4
Beast Academy 4A Beast Academy 4B Beast Academy 4C Beast Academy 4D Beast Academy 4 Puzzles
Level 5
Beast Academy 5A Beast Academy 5B Beast Academy 5C Beast Academy 5D
Science
Level 3
Beast Academy Science 3A
Beast Academy Science 3B
RECOMMENDATIONS
Curriculum
Elementary School Math Prealgebra and Algebra Beyond Algebra I Advanced HS Math
Contest Preparation
Elementary School Middle School Contests High School Contests High School Olympiads
OTHER BOOKS & GEAR
Apparel
AoPS T-Shirt AoPS Hoodie Beast Academy T-Shirt
Kitchen Table Math
Kitchen Table Math 2 Kitchen Table Math 3
MOEMS
MOEMS Contest Problems: Volume 2 MOEMS Contest Problems: Volume 3
MATHCOUNTS
Practice Competitions 1 Practice Competitions 2
AMC / USAMO
Contest Problem Book VI Contest Problem Book VII Contest Problem Book VIII
Mandelbrot
The First Five Years Mandelbrot Morsels The Mandelbrot Problem Book
ALL PRODUCTS
Introduction Series
Prealgebra Intro to Algebra Intro to Counting & Probability Intro to Geometry Intro to Number Theory
Intermediate / Advanced
Intermediate Algebra Intermediate Counting & Probability Precalculus Calculus
Competition Preparation
AoPS Volume 1 AoPS Volume 2 Competition Math
Beast Academy
Beast Academy 1A Beast Academy 1B Beast Academy 1C Beast Academy 1D Beast Academy 1 Puzzles Beast Academy 2A Beast Academy 2B Beast Academy 2C Beast Academy 2D Beast Academy 2 Puzzles Beast Academy 3A Beast Academy 3B Beast Academy 3C Beast Academy 3D Beast Academy 3 Puzzles Beast Academy Science 3A Beast Academy Science 3B Beast Academy 4A Beast Academy 4B Beast Academy 4C Beast Academy 4D Beast Academy 4 Puzzles Beast Academy 5A Beast Academy 5B Beast Academy 5C Beast Academy 5D
Apparel
AoPS T-Shirt AoPS Hoodie Beast Academy T-Shirt
Kitchen Table Math
Kitchen Table Math 2 Kitchen Table Math 3
MOEMS
Math Olympiad Volume 2 Math Olympiad Volume 3
MATHCOUNTS
Practice Competitions 1 Practice Competitions 2
AMC / USAMO
Contest Problem Book VI Contest Problem Book VII Contest Problem Book VIII
Mandelbrot
The First Five Years Mandelbrot Morsels The Mandelbrot Problem Book
Gift Certificates
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AoPS Online Books

What would you like to study?
Curriculum
Elementary School Math
Prealgebra and Algebra
Beyond Algebra 1
Advanced High School Math
Contest Preparation
Elementary School Contests
Middle School Contests
High School Contests
High School Olympiads

Much of AoPS's curriculum, specifically designed for high-performing math students in grades 5-12, is now available online!

Our online books offer the same content as our print books. The online books work directly in your web browser: there is no additional software to download. (Students must be signed onto the AoPS website to access an online book.) Students will have immediate access to the online book upon purchase: no waiting for a print book to be shipped.

Schools: Please contact us at sales@artofproblemsolving.com for institutional licensing.

View a sample:

Prealgebra Chapter 5, Section 3: Solving Linear Equations II

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