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PlayWithSERCH
@PlayWithSERCH
August 2021
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Реши систему уравнений методом подстановки:
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zhenyaM2002
Verified answer
{x - 2y = - 13 ⇒ x = 2y - 13
{7x - 4y = 7
Метод подстановки:
7(2у - 13) - 4у = 7
14у - 91 - 4у = 7
10у - 91 = 7
10у = 7 + 91
10у = 98
у = 98 :10
у = 9,8
х = 2 * 9,8 - 13 = 19,6 - 13
х = 6,6
Проверим:
6,6 - 2* 9,8 = 6,6 - 19,6 = - (19,6 - 6,6)= - 13
7 * 6,6 - 4*9,8 = 46,2 - 39,2 = 7
Ответ : ( 6,6 ; 9,8 ) .
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eldar31
{ x= -13+2y
{ 7x-4y=7
7(-13+2y)-4y=7
-91+14y-4y=7
10y=98
y=9,8
x=6,6
Ответ: (6,6 ; 9,8)
0 votes
Thanks 0
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Answers & Comments
Verified answer
{x - 2y = - 13 ⇒ x = 2y - 13{7x - 4y = 7
Метод подстановки:
7(2у - 13) - 4у = 7
14у - 91 - 4у = 7
10у - 91 = 7
10у = 7 + 91
10у = 98
у = 98 :10
у = 9,8
х = 2 * 9,8 - 13 = 19,6 - 13
х = 6,6
Проверим:
6,6 - 2* 9,8 = 6,6 - 19,6 = - (19,6 - 6,6)= - 13
7 * 6,6 - 4*9,8 = 46,2 - 39,2 = 7
Ответ : ( 6,6 ; 9,8 ) .
{ 7x-4y=7
7(-13+2y)-4y=7
-91+14y-4y=7
10y=98
y=9,8
x=6,6
Ответ: (6,6 ; 9,8)