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.
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Skyline Middle School Math |
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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.
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