Matematika

Pertanyaan

9/x+y + 8/x-y = 11 dan 3/x+y + 5/x-y = 6

1 Jawaban

  • a =1/ x+y
    b = 1/x - y

    9a + 8b = 11
    3a + 5b = 6 (x3)

    9a + 8b = 11
    9a + 15b = 18 (-)
    -7b = - 7
    b = 1

    3a + 5b = 6
    3a + 5= 6
    3a = 1
    a = 1/3

    1/(x+y) = a  = 1/3
    x + y  = 3

    1/(x-y) = b = 1
    x - y = 1

    x + y = 3
    x - y = 1..(+)
    2x = 4
    x = 2

    x + y = 3
    2 + y = 3
    y = 1

    (x,y)= (2,1)




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