Вопрос школьника по предмету Алгебра
{7x−3y=2,
{-2x+2y=20
Відповідь: x=
;y=
Ответ учителя по предмету Алгебра
7x — 3y = 2
-2x + 2y = 20
7x — 3y = 2
2y =2x + 20
7x — 3y = 2
y = x + 10
7x — 3(x + 10) = 2
7x — 3x — 30 = 2
4x = 32
x = 8
y = 8 + 10
y = 18
Ответ: (8; 18)
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