Вопрос:
532. Solve the system of equations: { 7x + 3y = 1, 2x - 6y = -10.
Смотреть решения всех заданий с листаОтвет:
Решение:
- Умножим первое уравнение на 2:
14x + 6y = 2. - Сложим новое первое уравнение со вторым:
(14x + 6y) + (2x - 6y) = 2 + (-10). - Приведем подобные слагаемые:
16x = -8. - Найдем
x: x = -1/2. - Подставим
x = -1/2 в первое уравнение: 7(-1/2) + 3y = 1. -7/2 + 3y = 1.3y = 1 + 7/2 = 9/2.y = 3/2.
Ответ: x = -1/2, y = 3/2
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