Thinking about how to solve for an unknown mystery mass using linear equations.

In this short video review why you do the same thing to both sides of an equations to keep balance.

Review how to solve one-step equations with this short video.

In this video tutorial students explore why they should perform the same operation on both sides of the equal sign when solving an equation.

Students explore why we can represent the unknown mass problem as a simple equation.

Students learn about why when solving a two-step equation you have to perform the inverse operation on both sides of the equal sign.

Jesse Roe and Sal Khan talk about why we use letters in algebra.