Matematika

Pertanyaan

jawab plis plis
sekarang sebelum jam 12
yang menjawab tak madain masuk surga
jawab plis plis sekarang sebelum jam 12 yang menjawab tak madain masuk surga

1 Jawaban

  • 1) x - 2y = 1
    x - y = 2
    -----------------(-)
    - y = - 1
    y = 1
    x - y = 2
    x - 1 = 2
    x = 2 + 1
    x = 3
    hp = {3,1}

    2) x + 2y = 2 |×2
    2x - y = 9
    2x + 4y = 4
    2x - y = 9
    -----------------(-)
    5y = - 5
    y = - 1
    x + 2y = 2
    x + 2(-1) = 2
    x - 2 = 2
    x = 2 + 2
    x = 4
    hp = {4,-1}

    3)y - 2x = - 1
    y - x = 2
    -------------------(-)
    - x = - 3
    x = 3
    y - x = 2
    y - 3 = 2
    y = 2 + 3
    y = 5
    hp = {3,5}

    4) 2x - y = 5
    3x + y = 11
    ------------------(+)
    5x = 16
    x = 16/5
    2x - y = 5
    2(16/5) - y = 5
    32/10 - y = 5
    - y = 5 - 32/10
    - y = 50/10 - 32/10
    - y = 18/10
    y = - 18/10
    hp = {16/5 , - 18/10}

    5)2x - 3y = 4 |×1
    x + 2y = 9 |×2
    2x - 3y = 4
    2x + 4y = 18
    ------------------(-)
    - 7y = - 14
    y = 2
    x + 2y = 9
    x + 2(2) = 9
    x + 4 = 9
    x = 9 - 4
    x = 5
    hp = {5,2}