Предмет: Алгебра, автор: serbakdasa623

Розв'язати систему рівнянь: 3х – у = -1,

х + 2у = 9

даю 10 балов

Ответы

Автор ответа: GovyajiyDoshik

1

Ответ:

(1;4)

Объяснение:

3x - y = -1
x + 2y = 9

Выразим x из второго уравнения и подставим в первое:

3(9-2y) - y = -1
x = 9 - 2y

---

27 - 6y - y = -1
x = 9 - 2y

---

27+1 = 6y+y
x = 9-2y

---

28 = 7y
x = 9-2y

---

y = 4
x = 1

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