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natalia19802
@natalia19802
July 2022
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помогите пожалуйста решить 1 задание в,б,г
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гюйс
Verified answer
Б)
3х-7у=32
х=-5у-4
3( -5у-4)-7у=32
х=-5у+4
-15у-12-7у=32
х=-5у-4
-22у=44
х=-5у+4
у= - 2
х=14
(14; -2)
в)
4х+7у=40
-4х+9у=24
16у=64
у=4
4х+7*4=40
4х=40-28
4х=12
х=3
(3; 4)
г)
2х-3у= -4
5х+у=7
2х-3у= -4
у=7-5х
2х-3(7-5х)= -4
у=7-5х
2х-21+15х=-4
у=7-5х
17х=17
у=7-5х
х=1
у=7-5
х=1
у=2
(1; 2)
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Answers & Comments
Verified answer
Б)3х-7у=32
х=-5у-4
3( -5у-4)-7у=32
х=-5у+4
-15у-12-7у=32
х=-5у-4
-22у=44
х=-5у+4
у= - 2
х=14
(14; -2)
в)
4х+7у=40
-4х+9у=24
16у=64
у=4
4х+7*4=40
4х=40-28
4х=12
х=3
(3; 4)
г)
2х-3у= -4
5х+у=7
2х-3у= -4
у=7-5х
2х-3(7-5х)= -4
у=7-5х
2х-21+15х=-4
у=7-5х
17х=17
у=7-5х
х=1
у=7-5
х=1
у=2
(1; 2)