What is a variable?

Our focus here is understanding that a variable is just a symbol that can represent different values in an expression. We got this. Just watch.

Evaluating an expression with one variable

Learn how to evaluate an expression with variables using a technique called substitution (or "plugging in").

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# Why aren't we using the multiplication sign?

Great question. In algebra, we do indeed avoid using the multiplication sign. We'll explain it for you here. Created by Sal Khan.