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Mathematics 18 Online
OpenStudy (anonymous):

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OpenStudy (aroub):

z=-7+x+2y 2x+2y-(-7+x+2y)=9 2x+2y+7-x-2y=9 x+7=9 x=2 4x - y + 3z = -2 4(2)-y+3(-7+2+2y)=-2 8-y-21+6+6y=-2 5y-7=-2 5y=5 y=-1 z=-7+x+2y z=-7+2-2 z=-7 => (2,-1,-7)

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