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Melisa12
@Melisa12
July 2022
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Решите систему уравнений
а) у-3х=9
3х+5у=9
б) 6х+5у=32
3х-у=2
в) х+2у=5
5х-3у=12
г)4х-у=4
8х-3у=4
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Answers & Comments
SvetikKanfetik
А) y-3x=9
3x+5y=9
——————
6y=18
y=3
3-3x=9
x=-2
б) 6x+5y=32
3x-y=2 |-2
6x+5y=32
-6x+2y=-4
—————
7y=28
y=4
3x-4=2
x=2
в) х+2у=5 |-5
5х-3у=12
-5х-10у=-25
5х-3у=12
–————
-13у=-13
у=1
х+2*1=5
х=3
г) 4х-у=4 |-2
8х-3у=4
-8х+2у=-8
8х-3у=4
-у=-4
у=4
4х-4=4
х=2
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Answers & Comments
3x+5y=9
——————
6y=18
y=3
3-3x=9
x=-2
б) 6x+5y=32
3x-y=2 |-2
6x+5y=32
-6x+2y=-4
—————
7y=28
y=4
3x-4=2
x=2
в) х+2у=5 |-5
5х-3у=12
-5х-10у=-25
5х-3у=12
–————
-13у=-13
у=1
х+2*1=5
х=3
г) 4х-у=4 |-2
8х-3у=4
-8х+2у=-8
8х-3у=4
-у=-4
у=4
4х-4=4
х=2