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What is y=x-7 3x-3y=21 by solving by substitution
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What is y=x-7 3x-3y=21 by solving by substitution

User NightMICU
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Ok first you really have plug in x-7 into y
So it turns into 3x-3x-21=21 I'm pretty sure you can figure the rest
User Wamae
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