Matematika

Pertanyaan

3x + 2y = 13 , 2x -5y = -4 (tentukan 10x - 3y)

2 Jawaban

  • 3x + 2y = 13 | dikali 2 | 6x + 4y = 26
    2x - 5y = - 4 | dikali 3 | 6x - 15y = -12 -
    Jwb : 19y = 38
    y = 2, x = 3
    maka, 10x - 3y = 10(3) - 3(2) = 24
  • 3x + 2y = 13 |×2
    2x - 5y = - 4 |×3
    maka
    6x + 4y = 26
    6x - 15y = - 12
    ---------------------(-)
    - 19y = 38
    y = - 2

    3x + 2y = 13
    3x + 2(-2) = 13
    3x - 4 = 13
    3x = 13 + 4
    3x = 17
    x = 17/3

    nilai
    10x - 3y
    = 10(17/3) - 3(-2)
    = 170/3 + 6
    = 170/3 + 18
    = 188/3
    = 62 ⅔

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