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help please solve the system using substitution x=3y-4 x+y=16
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x+y=16 3y-4+y=16 ... replace x with 3y-4 4y-4 = 16 y = ???
would you subtract 4 from 16 to make it 12 or 4 from 4 ?
you add 4 to both sides actually
you do that to move the "-4" over so to speak
oh yeah. so move "-4" over to 16?
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