Purplemath
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Seven-page Purplemath module on linear systems: definitions, graphing, special cases, substitution, elimination, and Gaussian elimination, with worked examples. Learners can classify systems as consistent, inconsistent, or dependent and solve them by hand.
More resources on Systems of Equations
MathIsFun
Illustrated introductory page on systems of linear equations, solving two- and three-variable systems by substitution and elimination with step-by-step worked examples. Readers learn why a system has one solution, no solution or infinitely many, and what consistent and inconsistent mean.
Khan Academy
Interactive lessons and practice problems on systems of equations
Systems of Equations and Inequalities
Master solving systems of equations and inequalities with this comprehensive course from Khan Academy. Learn algebraic techniques and graphical solutions!
Linear Algebra - Foundations to Frontiers
Learn the mathematics behind linear algebra and link it to matrix software development.
Algebra: Elementary to Advanced - Polynomials and Roots
Third course in Johns Hopkins's algebra sequence, covering exponential functions, polynomial arithmetic and factoring, square and nth roots, and percent and interest applications. Finishes with a cumulative exam, preparing you for precalculus, statistics or data science coursework.
mathsisfun.com
MathIsFun.com is a beginner-friendly math site that explains concepts with clear, step-by-step lessons and interactive activities. It covers topics from algebra and linear equations to geometry, fractions, data, and more, with practice problems, worksheets, and quizzes.