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Tolong di jawab secepatnya MTK materi SISTEM PERSAMAAN LINEAR TIGA VARIABEL beserta caranya terimakasih
Tolong di jawab secepatnya MTK materi SISTEM PERSAMAAN LINEAR TIGA VARIABEL beserta caranya terimakasih

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2 Jawaban

  • 1) 5z = 20
    z = 4
    5y - 2z = 2
    5y - 2(4) = 2
    5y - 8 = 2
    5y = 2 + 8
    5y = 10
    y = 2
    3x + 2y - z = - 3
    3x + 2(2) - 4 = - 3
    3x + 4 - 4 = - 3
    3x = - 3
    x = - 1
    nilai x = - 1 (C)

    2) 6z = 3
    z = 3/2 = ½
    3y - 4z = - 5
    3y - 4(½) = - 5
    3y - 2= - 5
    3y = 2 - 5
    3y = - 3
    y = - 1
    x + y + 2z = 2
    x - 1 + 2(½) = 2
    x - 1 + 1 = 2
    x + 0 = 2
    x = 2
    nilai (x - y) = 2 + 1 = 3 (E)

  • 3x+2y -z = -3 , 5y-2z = 2 , 5z=20   dit: x .  

    5z=20 ---> z=20/5 ---> z=4

    5y-2z=2 ---> 5y=2+2.4 --> y=10/5 --> y=2

    3x+2y-z=-3 --> 3x=-3-2(2) +4 --> x= -3/3 ---> x=-1

    jadi x = -1 Jawbannya C

    dan nomor selanjutnya

    x+y+2z=2 , 3y-4z=-5 , 6z=3 dit: x-y

    6z=3 --> z= 1/2

    3y-4z=-5 --> y=-3/3 = -1

    x+y+2z=2 --> x= 2

    jadi x -y = 2 - (-1) = 3+1 = 3 jawabannya E

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