Matematika

Pertanyaan

Nilai x+y+z dari persamaan
2x+3y+z=6
3x+2y+z=7
x+2y+z=5
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1 Jawaban

  • 2x+3y+z=6........ (1)
    3x+2y+z=7..........(2)
    x+2y+z=5.........(3)

    3x+2y+z=7..........(2)
    x+2y+z=5.............(3)
    ________ -
    2x = 2
    x = 1

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

    3y+z = 4
    2y+z = 4
    ________ -
    1y = 0
    y= 0

    x+2y+z=5.............(3)
    1+2(0)+z= 5
    1+0+z= 5
    1+z = 5
    z = 5-1
    z= 4

    x+y+z
    1+0+4
    5

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