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11 December, 05:44

Find x+y, if12x+13y=29and 13x+12y=21

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  1. 11 December, 07:53
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    if 12x+13y=29 and 13x+12y=21

    you sum up both equations:

    (12+13) x + (12+13) y=29+21

    25x+25y=50

    25 (x+y) = 50

    x+y=50/25

    x+y=2
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