Предмет: Алгебра, автор: nagitoplsmarryme

решите пожалуйста эти системы линейных уравнений способом сложения :(
7х+у=20
х-5у=8

5х+8у=-1
х+2у=4​

Ответы

Автор ответа: angelinaliverova06
1

Ответ:

в первом х=3, у=-1

во втором х=-17, у= 10,5

Объяснение:

надеюсь, решение не требуется :)

nagitoplsmarryme: у вас верные ответы, просите, но мне нужно было решение. ничего страшного, все равно спасибо, хорошего дня! <3
angelinaliverova06: не за что, извиняюсь за отсутствие решения. привыкла, что всем необходимы только готовые ответы :)
Автор ответа: viktoria1448
1
1) 7х+у=20|*5
х-5у=8

35х+5у=100
х-5у=8

35х+5у+х-5у=100+8
36х=108
х=3

7*3+у=20
у=20-21
у=-1
Ответ: (3; -1)

2) 5х+8у=-1
х+2у=4|*-4

5х+8у=-1
-4х-8у=-16

5х+8у-4х-8у=-1-16
х=-17

5*(-17)+8у=-1
8у=-1+85
8у=84
у=10,5
Ответ: (-17; 10,5)

Удачи♥️♥️♥️




nagitoplsmarryme: СПАСИБО ОГРОМНОЕ ❣️❣️❣️
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