Main content

## Algebra basics (ASL)

### Course: Algebra basics (ASL) > Unit 5

Lesson 3: Substitution method for systems of equations (ASL)# Systems of equations with substitution: potato chips

To solve a system of equations using substitution...

1. Isolate one of the variables in one of the equations, e.g. rewrite 2x+y=3 as y=3-2x.

2. You can now express the isolated variable using the other one. *Substitute* that expression into the second equation, e.g. rewrite x+2y=5 as x+2(3-2x)=5.

3. Now you have an equation with one variable! Solve it, and use what you got to find the other variable.

## Want to join the conversation?

No posts yet.