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How do you know that substitution gives the answer to a system of equations?
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How do you know that substitution gives the answer to a system of equations?

User Chiko
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You put in the answers you got for your variables into one of the equations. If it gives you the correct answer then you solved it, if it's different then either it doesn't work or one of the steps wasn't completed correctly or at all.
User Bluevoid
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