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July 2022
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решите систему уравнений способом сложения
x+5y=7 2x+y=9
3y-x=1 3x-2y=10
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Lana725875
Verified answer
Х+5у=7
3у-х=1
-----------сложим
8у=8
у=1
х+5=7
х=7-5
х=2
------------------------------------------------------------------
2х+у=9 I 2
3х-2у=10 первое уравнение умножим на2 ,а потом сложим
------------------------------------
4х+2у=18
3х-2у=10
------------------------
7х=28
х=4
3*4-2у=10
-2у=10-12
-2у=-2
у=1
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Answers & Comments
Verified answer
Х+5у=73у-х=1
-----------сложим
8у=8
у=1
х+5=7
х=7-5
х=2
------------------------------------------------------------------
2х+у=9 I 2
3х-2у=10 первое уравнение умножим на2 ,а потом сложим
------------------------------------
4х+2у=18
3х-2у=10
------------------------
7х=28
х=4
3*4-2у=10
-2у=10-12
-2у=-2
у=1