Matematika

Pertanyaan

X-y+z=-4
2x+y+2z=-5
3x-y-z=-6

1 Jawaban

  • x - y + z = -4
    x = -4 + y - z

    2x + y + 2z = -5
    2(-4 + y -z ) + y + 2z = -5
    -8 +3y = -5
    3y = 3
    y = 1

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

    3x - y - z = -6
    3(-3-z) - y - z = -6
    -9 - 3z - 1 - z = -6
    -10 - 4z = -6
    -4z = 4
    z = -1

    x = -3 - z = -3 - (-1) = -2

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