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PolnoeDonyshko
@PolnoeDonyshko
November 2021
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zhenyaM2002
Verified answer
{ 3x + y = 1 ⇒ y = 1 - 3x
{ 2x - 3y = 8
Способ подстановки:
2x - 3(1 - 3x) = 8
2x - 3 + 9x = 8
11x - 3 = 8
11x = 8 + 3
11x = 11
x = 1
y = 1 - 3*1 = 1- 3
y = - 2
Ответ : ( 1 ; - 2) .
2)
{ - 5x + 4y = - 2 | * 3
{ 3х + 7у = - 27 | * 5
{ - 15x + 12y = - 6
{ 15x + 35y = - 135
Способ сложения:
- 15х + 12у + 15х + 35у = - 6 + ( - 135)
47у = - 141
у = -141/47
у = - 3
3х + 7 *(-3) = - 27
3х - 21 = - 27
3х = - 27 + 21
3х = - 6
х = -6/3
х = - 2
Ответ : ( - 2 ; - 3) .
1 votes
Thanks 1
malayaloveyou9
Держи, должно быть правильно.......
2 votes
Thanks 1
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Answers & Comments
Verified answer
{ 3x + y = 1 ⇒ y = 1 - 3x{ 2x - 3y = 8
Способ подстановки:
2x - 3(1 - 3x) = 8
2x - 3 + 9x = 8
11x - 3 = 8
11x = 8 + 3
11x = 11
x = 1
y = 1 - 3*1 = 1- 3
y = - 2
Ответ : ( 1 ; - 2) .
2)
{ - 5x + 4y = - 2 | * 3
{ 3х + 7у = - 27 | * 5
{ - 15x + 12y = - 6
{ 15x + 35y = - 135
Способ сложения:
- 15х + 12у + 15х + 35у = - 6 + ( - 135)
47у = - 141
у = -141/47
у = - 3
3х + 7 *(-3) = - 27
3х - 21 = - 27
3х = - 27 + 21
3х = - 6
х = -6/3
х = - 2
Ответ : ( - 2 ; - 3) .