Today instead of using addition to eliminate a term, we will be using subtraction to eliminate a term. When we added, we needed to make sure that one set of like terms was opposite one another like: 4x and 4x.

Skyline Middle School Math 

You're now pretty good at solving a system by using subtraction and addition. But what if there aren't any obvious terms to combine like 4x and 4x or 2y and 2y? The answer is multiplication! What we did with terms like 2y and 2y was just multiply the equation by a 1, so you really already know how to do this. This video will explain it even better.Today instead of using addition to eliminate a term, we will be using subtraction to eliminate a term. When we added, we needed to make sure that one set of like terms was opposite one another like: 4x and 4x.
