Вопрос школьника по предмету Алгебра
ДАЮ 15 БАЛЛОВ!!!!Решить систему линейных уравнений методом сложения.
2х + 3у = 13
4х -у = 5
Ответ учителя по предмету Алгебра
Ответ:
2х+3у=13|×2
4х-у=5
5у=21|:5
у=4,2
4х-4,2=5
4х=5+4,2
4х=9,2|:4
х=2,3
ДАЮ 15 БАЛЛОВ!!!!Решить систему линейных уравнений методом сложения.
2х + 3у = 13
4х -у = 5
Ответ:
2х+3у=13|×2
4х-у=5
5у=21|:5
у=4,2
4х-4,2=5
4х=5+4,2
4х=9,2|:4
х=2,3
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