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Lesson: Advance Algebra - 18

Substitution, continued

[Page 18 of 23]

Now let’s replace our new definition of x in the original equation to find y.

If , then:

 

Don’t forget the Order of Operations!

 

And that’s how you substitute. If you needed to find x as well, you could solve for y and substitute, or just plug the value for y into either equation.

You’d find that:

  

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