Question

) x - 2y - 2z = -1 x - y + z = -2 2x + y + 3z= 1

Answer 1

(x-2y-2z=-1

(x-y+z=-2

(2x+y+3z=1

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(x-2y-2z=-1

(2x+y+3z=1

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(x-y+z=-2

(2x+y+3z=1

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(5x+4z=1

(3x+4z=-1

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(z=-1

(x=1

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(1-y-1=-2

(y=2

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( x, y, z ) = ( 1, 2, -1 )