Ответ учителя по предмету Алгебра
Подставляя выражение y=6-4*x во второе уравнение, получаем уравнение с одной переменной x: 5*x-(6-4*x)=39, или 9*x-6=39, откуда 9*x=45 и x=45/9=5. Подставляя теперь найденное значение x в первое уравнение, находим y=6-4*5=-14. Тогда решение системы таково: x=5, y=-14. Ответ: x=5, y=-14.
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