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OpenStudy (anonymous):
4x-y+z=6 3x+2y-z=0 4x-y-3z=2 a) 7x+y=6 b) x-y=6 c) x+y=6 d) 7x-y=6
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OpenStudy (anonymous):
Since we only need a relation between x and y, let's eliminate z. Add the first 2 equations to get \[ 7x + y = 6 .\]
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