Предмет: Алгебра, автор: moodgopnig

6x-7y=310
12x-3y=420
выразить у через х или наоборот , помогите пожалуйста

Ответы

Автор ответа: egorgordievskih
1

Ответ на систему: y=-20, x=75

x через y: x = (310 - 7y)/6

Объяснение:

6x = 310 - 7y

x = (310 - 7y)/6

Подставляем во 2-ое:

((310-7y)/6)*12 - 3y = 420

(310-7y)*2 - 3y = 420

620-14y-3y=420

-220=11y

y=-20

x=(310+140)/6

x=75

Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Русский язык, автор: KateHelen
разбор предложения. ну там, повествовательное, распространенное и т.д. вот само предложение:
За напрасный труд никто спасибо не скажет.
1 год назад
Предмет: Английский язык, автор: К1а9т9я99
Помогите пожалуйста перевести английскийWhen I came back they said the boy had
refused to let anyone into the room. "You
can't come in," he said. "You mustn't get
what I have." I went up to him and found
him in exactly the position I had left him,
white-faced, but with the tops of his cheeks
flushed by the fever, staring still, as he had
stared, at the foot of the bed. I took his
temperature. "What is it?" "Something like a
hundred," I said. It was one hundred and
two and four tenths. "It was a hundred and
two," he said. "Who said so?" "The doctor."
"Your temperature is all right," I said. "It's
nothing to worry about." "I don't worry," he
said, "but I can't keep from thinking."
"Don't think," I said. "Just take it easy." "I'm
taking it easy," he said and looked straight-
ahead. He was holding tight on to himself
about something. I sat down and opened the
Pirate Book. But I could see he was not
following, so I stopped. "About what time do
you think I'm going to die?" he asked. "You
aren't going to die. What's the matter with
you?"
1 год назад
Предмет: Английский язык, автор: юляля1420да
Agent cute is alone in his house. he hasn't found a new job and his life is very boring at the moment. Read the list of things Agent cute wants to do today.
1Wash my hair
2 cook the food for the week
3 read the newspaper
4 clean the bedroom
5 write an email to Misha
6 buy a ticket to York
7 buy some fruit and vegetables
8 wash the windows
9 Go to the theatre

помогииииите, тетрадь завтра здавать
1 год назад
Предмет: Химия, автор: Джульчик
Помогите пожалуйста !!! срочно !!! сообщение на тему : "влияние минеральных удобрений на качество почвы "
8 лет назад
Предмет: Музыка, автор: ismatovkosta
Бетховен заставил говорить о себе весь мир как вы это понимаете
срочно надо!!!!!!!!!!! даю 40 балов
8 лет назад