Matematika

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Himpunan penyelesaian dari SPLTV: 2x+y-3z=-5, x-y+z=3, 3x+2y+z=16

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  • Materi : SPLTV
    Kelas  : X SMA

    2x + y - 3z = -5 ........... 1)
    x - y + z = 3 ................. 2)
    3x + 2y + z = 16 .......... 3)

    2x + y - 3z = -5 ....... ×1
    x - y + z     = 3 ........ ×2
    -------------------------------
    2x + y - 3z = -5
    2x - 2y + 2z = 6
    ------------------------------(-)
    3y - 5z = -11

    x - y + z = 3 ............. ×3
    3x + 2y + z = 16 ......  ×1
    --------------------------------
    3x - 3y + 3z = 9
    3x + 2y + z  = 16
    -------------------------------- (-)
    -5y + 2z = -7


    3y - 5z = -11 ...... ×5
    -5y + 2z = -7 ..... ×(-3)
    -----------------------------
    15y - 25z = -55
    15y - 6z = 21
    ---------------------- (-)
    -19z = -76
    z = 4

    3y - 5z = -11
    3y - 5(4) = -11
    3y - 20 = -11
    3y = -11 + 20
    3y = 9
    y = 3

    x - y + z = 3
    x - 3 + 4 = 3
    x + 1 = 3
    x = 3 - 1
    x = 2

    Hp = { 2 , 3 , 4}

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