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tata479
tata479
17.01.2021 05:13 •  Алгебра

Реши систему уравнений методом подстановки: {y=−4x и x−y=21

👇
Ответ:
sidletskiy
sidletskiy
17.01.2021

ответ:  (4,2; -16,8).

Объяснение:

Реши систему уравнений методом подстановки:

y=−4x;                (1)

x−y=21;              (2)

Из (1)   y=−4x  подставляем в (2)

x-(-4x)=21;

5x=21;

x=21/5=4.2  подставляем в (1)

y=-4*4.2;

y=-16.8.

4,4(47 оценок)
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Ответ:
nikitaaleksandrov
nikitaaleksandrov
17.01.2021

阿迪爾汗

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

4,4(29 оценок)
Ответ:
AlinaSh25
AlinaSh25
17.01.2021

Объяснение:

а) 14 + 3х > 18 – 5х

8x>4  / : 8

x> 1/2

                     

1/2 >

                   x ∈ (1/2;+∞)

б) 6(х + 5) ≤  3(5х – 11)

 6x+30 ≤  15x-33

30+33 ≤ 15x-6x

9x≥63  / :9

x≥7

               

7· >

   x ∈ [7;+∞)

в) 4(а² + 12) – (2а + 6)² > - 12

4a^2+48-4a^2-24a-36 > -12

-24a+12 > -12

-24a>-12-12

-24a>-24a / :(-24)

a < 1

       

1 >

a ∈ (-∞;1)

г) 6х ≥ 48.

                             6x ≥ 48 / : 6

                               x ≥ 8

                 

8 >

     x  ∈  [8;+∞)

4,4(60 оценок)
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