Предмет: Алгебра, автор: sdasfr

Крч тема: Система уравнений.Решение систем способом сложения.                                                  б)общая {5x+y=30
                  скобка {3x-4y=41                              в)общая {3a-2b=5
                                                                            скобка {a-4b=6

Ответы

Автор ответа: nKrynka
0
1)  5x + y = 30
     3x - 4y = 41

y = 30 - 5x
3x - 4*(30 - 5x) = 41

3x - 120 + 20x = 41
23x = 161
x = 7
y = 30 - 5*7
y = - 5
Ответ: (7; - 5)

2)  3a - 2b = 5
      a - 4b = 6

a = 4b + 6
3*(4b + 6) - 2b = 5

12b + 18 - 2b = 5
10b = - 13
b = - 1,3
a = 4*(- 1,3) + 6
a = - 5,2 + 6
a = 0,8
Ответ: (0,8 ; - 1,3)

 
Автор ответа: sdasfr
0
Бред какой-то.
Автор ответа: sdasfr
0
Ну ладн посмотрим спасибо.
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