Matematika

Pertanyaan

3x - 2y = -10
4x + 5z = 21
4y - 3z = -43
Tentukan nilai himpunan SLPTV
Dan nilai 2x - y - z

1 Jawaban

  • 3x - 2y = - 10
    - 2y = - 10 - 3x
    2y = 10 + 3x

    4y - 3z = - 43
    20 + 6x - 3z = - 43
    6x - 3z = - 63
    2x - z = - 21
    - z = - 21 - 2x
    z = 21 + 2x

    4x + 5z = 21
    4x + 105 + 10x = 21
    14x = 21 - 105
    14x = - 84
    x = - 6

    2y = 10 + 3x
    2y = 10 - 18
    2y = - 8
    y = - 4

    z = 21 + 2x
    z = 21 - 12
    z = 9

    2x - y - z = - 12 + 4 - 9
    = - 17

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