Khan Academy

Evaluating an expression with one variable (K-A)

Evaluating expressions with one variable (K-A)

What is a variable? (K-A)

Why aren't we using the multiplication sign? (K-A)

Abstract-ness (K-A)

Intro to the coordinate plane (K-A)

Origins of algebra (K-A)

The beauty of algebra (K-A)

Why all the letters in algebra? (K-A)

Evaluating expressions with two variables 1 (K-A)

Evaluating expressions with two variables 2 (K-A)

Evaluating expressions with two variables: fractions & decimals 1 (K-A)

Evaluating expressions with two variables: fractions & decimals 2 (K-A)

Writing basic expressions with variables 1 (K-A)

Writing basic expressions with variables 2 (K-A)

Writing expressions with variables & parentheses (K-A)

Writing expressions with variables (K-A)

Intro to equations (K-A)

Testing solutions to equations (K-A)

Variables, expressions, & equations (K-A)

Creating an equation with infinitely many solutions (K-A)

Creating an equation with no solutions (K-A)

Number of solutions to equations (K-A)

Worked example: number of solutions to equations (K-A)

Equations with parentheses (K-A)