Matematika

Pertanyaan

x - 4y - 2z = 21 ; 2x + y + 2z = 3 ; 3x - 2y - z = -2

1 Jawaban

  • Materi : SPLTV
    Kelas : X SMA

    x - 4y - 2z = 21 ....... 1)
    2x + y + 2z = 3 ....... 2)
    3x - 2y - z = -2 ........ 3)

    x - 4y - 2z = 21
    2x + y + 2z = 3
    ◆◆◆◆◆◆◆◆◆◆◆◆ [+]
    3x - 3y = 24 ............ 4)

    2x + y + 2z = 3 ..... ×1
    3x - 2y - z = -2 ..... ×2
    ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆
    2x + y + 2z = 3
    6x - 4y - 2z = -4
    ◆◆◆◆◆◆◆◆◆◆◆◆◆◆[+]
    8x - 3y = -1 ............ 5)

    3x - 3y = 24
    8x - 3y = -1
    ◆◆◆◆◆◆◆◆◆◆ [-]
    -5x = 25
    x = -5

    8x - 3y = -1
    8(-5) - 3y = -1
    -40 - 3y = -1
    -3y = -1 + 40
    -3y = 39
    y = -13

    x - 4y - 2z = 21
    -5 - 4(-13) - 2z = 21
    -5 + 52 - 2z = 21
    47 - 2z = 21
    -2z = 21 - 47
    -2z = -26
    z = 13

    Hp = { -5 , -13 , 13 }

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