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] …

Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values.

Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values.

We've seen linear and exponential functions, and now we're ready for quadratic functions. We'll explore how these functions and the parabolas they produce can be used to solve real-world …

We will now equate two algebraic expressions and think about how it might constrain what value the variables can take on. The algebraic manipulation you learn here really is the heart of …

Practice Up next for you: Solutions to 2-variable equations Get 3 of 4 questions to level up!

Equations with variables on both sides: decimals & fractions Get 3 of 4 questions to level up!

Evaluating expressions with multiple variables: fractions & decimals Evaluating expressions with variables word problems

A variable is a symbol that represents a value, often one that changes, like how long you've been awake. Learn ways that we can change an expression's value (such as by changing the …

To solve linear equations, find the value of the variable that makes the equation true. Use the inverse of the number that multiplies the variable, and multiply or divide both sides by it. …