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alekspupkin15
@alekspupkin15
August 2022
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гюйс
Verified answer
7х+у=20
х-5у=8
7х+у=20
х=8+5у
7(8+5у)+у=20
х=8+5у
56+35у+у=20
х=8+5у
36у= - 36
х=8+5у
у= - 1
х=8-5
у= - 1
х=3
(3; -1)
2.
3х+7у= -5 ( *-5)
5х+4у=7 ( *3)
-15х-35у=25
15х+12у=21
-23у=46
5х+4у=7
у= -2
5х - 8=7
у= -2
5х=15
у= -2
х=3
(3; -2)
3.
2-4у=3(х-2)
2(х+у)=5у+2,5
2-4у=3х-6
2х+2у=5у+2,5
3х+4у=8 ( *2)
2х-3у=2,5 ( *-3)
6х+8у=16
-6х+9у= - 7,5
8у=16
2х-3у=2,5
у=2
2х-6=2,5
у=2
2х=8,5
у=2
х=4,25
(4,25; 2)
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Answers & Comments
Verified answer
7х+у=20х-5у=8
7х+у=20
х=8+5у
7(8+5у)+у=20
х=8+5у
56+35у+у=20
х=8+5у
36у= - 36
х=8+5у
у= - 1
х=8-5
у= - 1
х=3
(3; -1)
2.
3х+7у= -5 ( *-5)
5х+4у=7 ( *3)
-15х-35у=25
15х+12у=21
-23у=46
5х+4у=7
у= -2
5х - 8=7
у= -2
5х=15
у= -2
х=3
(3; -2)
3.
2-4у=3(х-2)
2(х+у)=5у+2,5
2-4у=3х-6
2х+2у=5у+2,5
3х+4у=8 ( *2)
2х-3у=2,5 ( *-3)
6х+8у=16
-6х+9у= - 7,5
8у=16
2х-3у=2,5
у=2
2х-6=2,5
у=2
2х=8,5
у=2
х=4,25
(4,25; 2)