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5m - 3n = 19 ; …

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5m - 3n = 19 ; m - 6n = -7

    • Posted by Paras Jadhav 5 years, 7 months ago

    ICSE & ISC > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 7 months ago

    5m - 3n = 19 ......... (i)
    m - 6n = -7 ........... (ii)
    Multiple (i) by 2 , we get
    10m - 6n = 38........... (iii)
    Subtract (iii) and (ii), we get
    (10m - 6n)- (m - 6n) = 38 - (-7)
    10m - 6n - m + 6n = 38 + 7
    9m = 45
    m = 5
    Put m = 5 in (ii) we get
    5 - 6n = -7
    -6n = -7 - 5
    -6n = -12
    n = 2

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