· PDF file2y-18 18 12 6 9 —Y ) Z x 10 O ... 3x=9+2y 4X=3X-y+7 2x+y = 31 —y...

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Transcript of · PDF file2y-18 18 12 6 9 —Y ) Z x 10 O ... 3x=9+2y 4X=3X-y+7 2x+y = 31 —y...