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Mathematics
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1) x-y = 1 2x + y=8 2) y= 2x +3 y= 4x + 4 3) 2x + 7y = 8 x+5y=7 4) y=4x+4 y=2x + 8 5) 4x-7y=9 y=x-3 ?????
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so what you need to do ? solve theses systems of equations ? using substitution or elimination method ?
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