Вопрос школьника по предмету Алгебра
Розв’язати систему
1)4x+7y=-15
15 x-y=-29
2)4х+7у=-15
15х-у=-29
Заранее больше спасибо .
Ответ учителя по предмету Алгебра
умножим второе уравнение на7: 105х-7у=-203. сложим первое и второе: 109х=-218, х=-2. подставим х во второе: -30-у=-29, у=-1. ответ: х=-2,у=-1.
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