Main content

### Course: Algebra (all content) > Unit 2

Lesson 2: Why we do the same thing to both sides of an equation# Representing a relationship with an equation

In this lesson, we learn about balancing scales and solving equations. We discover that to find a mystery mass, we can set up an equation using equal signs and balance both sides. By subtracting the same amount from each side, we can solve for the unknown mass, helping us understand the relationship between the two sides of the scale. Created by Sal Khan.

## Want to join the conversation?

No posts yet.