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FeedRu1
@FeedRu1
August 2021
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помогите с уравнением, алгебра
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zhenyaM2002
Verified answer
{ 3x - y = - 1 | * 2
{ - x + 2y = 7
{ 6x - 2y = - 2
{ -x + 2y = 7
Способ сложения:
6х - 2у + ( - х + 2у) = - 2 + 7
(6х - х) + ( - 2у + 2у) = 5
5х = 5
х = 1
- 1 + 2у = 7
2у = 7 + 1
2у = 8
у = 4
х + у = 1 + 4 = 5
1 votes
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Answers & Comments
Verified answer
{ 3x - y = - 1 | * 2{ - x + 2y = 7
{ 6x - 2y = - 2
{ -x + 2y = 7
Способ сложения:
6х - 2у + ( - х + 2у) = - 2 + 7
(6х - х) + ( - 2у + 2у) = 5
5х = 5
х = 1
- 1 + 2у = 7
2у = 7 + 1
2у = 8
у = 4
х + у = 1 + 4 = 5