Lesson: Advance Algebra - 19

Substitution vs. Combination

Of course, on a standardized test, you’re working under a time limit. Therefore, it’s in your interest to recognize which method of solving systems will be faster on any given problem.

For example, this system:

...is just begging for combination, since the y and the –y will cancel out without any multiplication at all, and you’ll be able to quickly find the answer.

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