Предмет: Алгебра, автор: EgotinSmey

Помогите пожалуйста решить с объяснением:
$\left \{ {{3x+7y=1} \atop {6y - 5x=16}} \right.$

Ответы

Автор ответа: yuliaaa19

Вот!!!!!!!!!!!!!!!!!

Приложения:

Автор ответа: Аноним

Решим систему методом сложения, для этого умножим первое уравнение на 5, а второе на три получим

15х+35у=5

-15х+18у=48

после сложения получится 53у=53, откуда у=1

подставим 1 вместо у в уравнение 3х+7у=1 и найдем х

3х+7*1=1

3х=-6, откуда х= -2.

Ответ ( -2;1)

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Английский язык, автор: shipachev2

They're having a party tonight — mum and sister _____ all day long.

has been cooking
have cooked
have been cooking
has cooked
*
Mary looks exhausted. What _____ all working day?

has she been doing
she has been doing
has she done
have she been doing
*
Michelle __ 30 emails today!

has written
has been writing
have witten
is writing
Dave __ his colleagues recently.

hasn't been seeing
haven't seen
have been seeing
hasn't seen
*
Ben's eyes hurt — he _____ on a computer since the morning.

have been working
has been working
has worked
hasn't worked
*
Sorry, we are late. _____ for a long time?

Has you been waiting
Have you been waiting
You have been waiting
Have you waited
*
How long __ their history teacher?

they have been knowing
have they been knowing
have they known
they have known
*
My PC works well now. My brother _____ it.

has been repairing
have been reparing
have repaired
has repaired
Mum's hands are dirty. She ____ the flat since morning.

has cleaned
have cleaned
has been cleaning
have been cleaning
*
How many times _____ Sidney?

has he been visiting
has he visited
he has been visiting
he has visited
*
You don't need _____ money to buy this bag.

a lot of
some
much
many
*
I made _____ mistakes in the test this time and got a better mark.

a lot of
much
few
many
*
I can't find my key and I don't have _____ ideas where I left it.

a lot of
much
some
any
*
Could I have _____ more water, please?

any
some
a few
lots of
*
How _____ hours do you spend working on this project every day?

much
many
a few
any
*
Kids are quite overweight because they eat _____ sweets.

much
many
a lot of
few
Can I ask you ___ questions about your free time? It won't take __ time.

many, a lot of
a little, much
a few, much
few, many
*
Ted is not a kind person, that's why he has got very _____ friends.

few
a few
little
many
*
Do you need _____ help with your homework?

some
a lot of
many
any
*
How _____ time does it take to get to school?

many
few
much
little
She got a carton of _____ out of the fridge.

bread
juice
crisps
honey
*
Anne ordered another _____ of mineral water.

box
jar
slice
glass
*
I want to take this blouse _____, I found a stain at home.

off
back
away
out
*
Take _____ your sunglasses! I want to see your eyes.

away
out
off
back
We had ice cream and apple pie for _____.

takeaway
dessert
lunchbox
main course
*
I'm absolutely __ — I missed lunch.

overweight
family-sized
low-fat
starving
*
He wore a tweed suit and a silk _____ tie.

polka dot
silver
round
paper
*
The zebra is a black-and-white _____ animal.

velvet
woollen
plain
striped
*
He seems to be _____ this morning - you can hardly keep him quiet.

my cup of tea
full of beans
a hot potato
a couch potato
Jazz just isn't my _____ - I prefer classical music.

piece of cake
as cool as cucumber
cup of tea
bread and butter

5 лет назад

Предмет: География, автор: merjik1

какие крупнейшие предприятия области Казахстана

5 лет назад

Предмет: Немецкий язык, автор: bebebebeb5

Land und Leute Bei Bahnreisen gibt es viele Sonderangebote. In Deutschland gibt es Z. B. sehr billige Fahrkarten für das Wochenende und man kann Geld sparen, wenn man eine BahnCard hat oder die genaue Fahrzeit schon beim Fahrkartenkauf festlegt. Informationen findet man unter:

переведите со словарем или дословно, переводчик переводит с ошибками.

5 лет назад

Предмет: Биология, автор: ksyucharykova

Все зимующие почки развиааются весной

9 лет назад

Предмет: Математика, автор: sok4

Агрофирма владеет
140 га земли, 16% которой занимает яблоневый сад.Найдите площадь сада

9 лет назад