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28 November, 18:42

3x + y - z = - 6

2x - y + 2z = 8

4x + y - 3z = - 21

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Answers (1)
  1. 28 November, 19:07
    0
    x=-1

    y=4

    z=7

    Step-by-step explanation:

    3x + y - z = - 6 (1)

    2x - y + 2z = 8 (2)

    4x + y - 3z = - 21 (3)

    (1) + (2) : 5x+z=2 (4)

    (2) + (3) : 6x-z=-13 (5)

    (4) + (5) : 11x=-11

    x=-1

    so z=2-5x=7

    y=-6-3x+z=4
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