) Решите систему уравнений подстановки: 5х+у=14
2х-3у=9
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10.04.2020 02:09
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ответ: х=3; у=-1
Пошаговое объяснение:из первого уравнения у=14-5х
Подставляем во второе получается 2х-3*(14-5х)=9
2х-42+15х=9
17х-42=9
17х=9+42
17х=51
х=3
Подставляем х в первое уравнение
5*3+у=14
15+у=14
у=14-15
у=-1