Matematika

Pertanyaan

1.3x-7=14
2.3x-9=4x+5
3.2(3x+4)=6-(2x+5)

2 Jawaban

  • Mapel : Matematika
    Kelas : VIII SMP
    Bab : PLSV

    Pembahasan :
    3x - 7 = 14
    3x = 14 + 7
    3x = 21
    x = 21/3
    x = 7

    ————————————————
    3x - 9 = 4x + 5
    4x - 3x = -9 - 5
    x = -14

    ————————————————
    2(3x + 4) = 6 - (2x + 5)
    6x + 8 = 6 - 2x - 5
    6x + 8 = 1 - 2x
    6x + 2x = 1 - 8
    8x = -7
    x = -7/8
  • Bab : Persamaan linear Dua Variabel
    Kelas : VII SMP

    => 3x - 7 = 14
    => 3x = 14 + 7
    => 3x = 21
    => x = 7

    => 3x - 9 = 4x + 5
    => 3x - 4x = 5 + 9
    => -x = 14
    => x = -14

    => 2(3x + 4) = 6 - (2x + 5)
    => 6x + 8 = 6 - 2x - 5
    => 6x + 2x = 6 - 5 - 8
    => 8x = -7
    => x = -7/8

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