Предмет: Математика, автор: Аноним

{5х+у=-2
{7х+4у=5
Решите систему
ПОМОГИТЕ ПОЖАЛУЙСТА ДАМ 18 БАЛЛОВ

Ответы

Автор ответа: nastyapetrova2ox54oa

2

Ответ:

из первого уравнения выражаем у: у=-2-5х

подставляем во второе:

7х+4(-2-5х)=5

7х-8-20х=5

13х= -13

х= -1

у= -2-5*(-1)

у=3

Ответ: х= -1, у= 3

Пошаговое объяснение:

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