Matematika

Pertanyaan

* pers linear 2 variabel
2x + 3y = 11
3x - y = 11

2 Jawaban

  • 2x + 3y = 11  (x1)
    3x - y = 11     (x3)
    --------------------------
    2x + 3y = 11
    9x - 3y = 33
    ------------------------- +
    11x = 44
    x = 44 / 11
    x = 4

    2x + 3y = 11
    2(4) + 3y = 11
    8 + 3y = 11
    3y = 11 - 8
    3y = 3
    y = 1

    maka
    x = 4
    y = 1
  • 2x + 3y = 11 | x3
    3x - y = 11 | x2

    6x + 9y = 33
    6x - 2y = 22
    ___________ _
    11y = 11
    y = 11/11
    y = 1

    2x + 3y = 11
    2x + 3(1) = 11
    2x + 3 = 11
    2x = 11-3
    2x = 8
    x = 8/2
    x = 4

    Semoga bermanfaat. ^_^ **

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