Ответ учителя по предмету Алгебра
2x + y = 7
x = 2y + 11
2(2y + 11) + y = 7
x = 2y + 11
4y + 22 + y = 7
x = 2y + 11
5y + 22 = 7
x = 2y + 11
5y = — 15
x = 2y + 11
y = — 3
x = 2*(-3) + 11
y = — 3
x = 5
(5; — 3) — ответ
2x + y = 7
x = 2y + 11
2(2y + 11) + y = 7
x = 2y + 11
4y + 22 + y = 7
x = 2y + 11
5y + 22 = 7
x = 2y + 11
5y = — 15
x = 2y + 11
y = — 3
x = 2*(-3) + 11
y = — 3
x = 5
(5; — 3) — ответ
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