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3x-5y-4=0 and 9x= 2y+7

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3x-5y-4=0 and 9x= 2y+7

    • Posted by Vandit Katbamna 5 years, 6 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 6 months ago

    3X - 5Y = 4----------(1)
    9X - 2Y = 7-------------(2)

    From EQUATION (1) we get,
    3X - 5Y = 4

    3X = 4+5Y

    X = 4+5Y/3 -------------(3)

    Putting the value of X in equation (2)
    9X - 2Y = 7
    9 × (4+5Y/3) - 2Y = 7
    3(4+5Y) - 2Y = 7
    12 + 15Y - 2Y = 7
    13Y = 7 -12
    13Y = -5
    Y = -5/13

    Putting the value of X in equation (3)

    X = 4+5Y/3 => 3 + 5 × -5/13 = 3 - 25/13 /3
    X = 39 - 25/13/3 = 14/13/3 => 14/13 × 1/3 => 14/9

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