Вопрос школьника по предмету Алгебра
ПОЖАЛУЙСТА!
умножьте одно из уравнений системы или каждое из них на какое либо число так , чтобы с помощью сложения можно было исключить одну из переменных:
a + b = 4 и 2a + 7b = 2
ПОЖАЛУЙСТА! умножьте одно из уравнений системы или каждое из них на какое либо число так , чтобы с помощью сложения можно было исключить одну из переменных: a + b = 4 и 2a + 7b = 2
Ответ учителя по предмету Алгебра
Объяснение:
первое уравнение умножаем на (-2) => -2а-2b=-8
-2a-2b=-8
+
2a+7b=2
складываем, и получается: 5b= -6
исключили переменную а
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