23-11-2016
Mathematics

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

Respuesta :

23-11-2016

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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