Matematika

Pertanyaan

×+y=5
2×+y=2

×-2y=6
2×-y=9

1 Jawaban

  • 1)
    x+y=5
    2x+y=2
    _____ -
    -x = 3
    x = -3

    x + y = 5
    y - 4 = 5
    y = 5 + 4
    y = 9



    2)

    ×-2y=6 (x2
    2×-y=9


    2x - 4y = 12
    2x - 9y = 9
    _______ -
    5y = 3
    y = 3/5

    x - 2y = 6
    x - 2(3/5)= 6
    x - 6/5 = 6
    x = 6/5 + 6
    x = 6 6/5
    x = 7 1/5

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