Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more.

Learn fifth grade math—arithmetic with fractions and decimals, volume, unit conversion, graphing points, and more. This course is aligned with Common Core standards.

Regardless of who you are, mastering even just one more skill on Khan Academy results in learning gains.

Khan Academy's Algebra 1 course is built to deliver a comprehensive, illuminating, engaging, and Common Core aligned experience! **Teaching this course? Check out our [teacher resources] …

The elimination method is a technique for solving systems of linear equations. This article reviews the technique with examples and even gives you a chance to try the method yourself.

In some cases, we need to slightly manipulate a system of equations before we can solve it using the elimination method. See how it's done in this video.

Elimination works because it eliminates one of the variables, we can solve the equation only if there is 1 variable and not 2 variables.

This isn't a big deal, but when you get into higher classes, you want eliminate these minor mistakes. So I'd recommend reading the problem fully, and looking at each step after you do it, …

Unit 1: Vectors and spaces Vectors Linear combinations and spans Linear dependence and independence Subspaces and the basis for a subspace Vector dot and cross products …

Row-echelon form & Gaussian elimination Learn Solving linear systems with matrices