• Matéria: Matemática
  • Autor: luizob6
  • Perguntado 4 anos atrás

Qual dos pares ordenados abaixo é solução, ao mesmo tempo, das equações 2x - y = 2 e 5x - 2y = 8? * ( 5, 8) (4, 6) (8, 5) (6, 4) ​

Respostas

respondido por: fernandomizael1
1

Resposta:

o par baixo que e a solução ao mesmo tempo e (4,6)

Explicação passo a passo:

respondido por: luanvitor1509
0

a)

x + y = 8

x = 0

0 + y = 8

y = 8

(0,8)

===================================

x = 1

1 + y = 8

y = 8 - 1

y = 7

(1,7)

==============================

x = 2

2 + y = 8

y = 8 - 2

y = 6

(2,6)

=================================

x = 3

x + y = 8

3 + y = 8

y = 8 - 3

y = 5

(3,5)

=============================

x = 4

x + y = 8

4 + y = 8

y = 8 - 4

y = 4

(4,4)

-------------------------------------------

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b)

x = 0

x+2y=20

0 + 2y = 20

2y = 20

y = 20/2

y = 10

---------------------------------------

x = 2

x + 2y = 20

2 + 2y = 20

2y = 20 - 2

2y = 18

y = 18/2

y = 9

----------------------------------------------

x = 4

x+2y=20

4 + 2y = 20

2y = 20 - 4

2y = 16

y = 16/2

y = 8

-------------------------------------------------

x = 6

x + 2y = 20

6 + 2y = 20

2y = 20 - 6

2y = 14

y = 14/2

y = 7

-----------------------------------------------

x = 8

x+2y=20

8 + 2y = 20

2y = 20 - 8

2y = 12

y = 12/2

y = 6

-------------------------------------------

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c)

x = 0

x-y=5

0 - y = 5 ( - 1)

y = - 5

---------------------------------------

x = 1

x-y=5

1 - y = 5

1 - 5 = y

- 4 = y

y = - 4

--------------------------------------

x = 2

x - y = 5

2 - y = 5

2 - 5 = y

- 3 = y

y = - 3

-------------------------------

x = - 1

x - y = 5

- 1 - y = 5

- 1 - 5 = y

- 6 = y

y = - 6

--------------------------------------------

x = 5

x-y=5

5 - y = 5

5 - 5 = y

0 = y

y = 0

----------------------------------------

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d) x\2 + y=4

x = 0

0/2 + y = 4

y = 4

------------------------

x = 2

x\2 + y=4

2/2 + y = 4

4 + y = 4

y = 4 - 4

y = 0

----------------------------------

x = 4

x\2 + y=4

4/2 + y = 4

2 + y = 4

y = 4 - 2

y = 2

-------------------------------------

x = 6

x\2 + y=4

6/2 + y = 4

3 + y = 4

y = 4 - 3

y = 1

-----------------------------

x = 8

x\2 + y=4

8/2 + y = 4

4 + y = 4

y = 4 - 4

y = 0

-------------------------

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e) 5x+y=20

x = 0

5.0 + y = 20

y = 20

---------------------------------

x = 1

5x+y=20

5.1 + y = 20

5 + y = 20

y = 20 - 5

y = 15

----------------------------------------

x = 2

5x+y=20

5.2 + y = 20

10 + y = 20

y = 20 - 10

y = 10

-------------------------------------------------

x = 3

5x+y=20

5.3 + y = 20

15 + y = 20

y = 20 - 15

y = 5

--------------------------------------------------

x = 4

5x+y=20

5.4 + y = 20

20 + y = 20

y = 20 - 20

y = 0

------------------------------------------------

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f) x + y\3=1

x = 0

y = 1

3

y = 3.1

y = 3

-----------------------------------

x = 1

x + y\3=1

1 + y/3 = 1

y = 1 - 1  

3

y = 0

3

y = 0

------------------------------

x = 2

x + y\3=1

2 + y  =  1

     3

y = 1 - 2

3

y = - 1

3

y = - 3

----------------------------------

x = 3

x + y\3=1

3 + y  =  1

     3

y = 1 - 3

3

y = - 2

3

y = - 6

--------------------------------

x = 4

x + y\3=1

4 + y  =  1

     3

y = 1 - 4

3

y = - 3

3

y = - 9

-------------------------------------------

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g)

x = 0

2x+2y=10

2.0 + 2y = 10

2y = 10

y = 10/2

y = 5

--------------------------------

x = 1

2x+2y=10

2.1 + 2y = 10

2 + 2y = 10

2y = 10 - 2

2y = 8

y = 8/2

y = 4

-------------------------------

x = 2

2x+2y=10

2.2 + 2y = 10

4 + 2y = 10

2y = 10 - 4

2y = 6

y = 6/2

y = 3

-------------------------------

x = 3

2x+2y=10

2.3 + 2y = 10

6 + 2y = 10

2y = 10 - 6

2y = 4

y = 4/2

y = 2

----------------------------

x = 4

2x+2y=10

2.4 + 2y = 10

8 + 2y = 10

2y = 10 - 8

2y = 2

y = 2/2

y = 1

-----------------------------------------------------------------------

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h) y= x\5

x = 1

y = 1

     5

----------------

x = 2

y = 2

     5

-----------------

x = 3

y = 3

     5

---------------

x = 4

y = 4

     5

--------------

x = 0

y = 0

     5

y = 0

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