Question

Resolver as equações do 1° grau abaixo:

1) 2x – 5 = 10

2) 4x – 5 = x + 8

3) 12 + x = 5 – 5x

4) 2x = 18

5) 7x = - 7

6) 4x – 12 = 10

7) – x = - 17

8) – 3x = 15​

Answer 1

Resposta:

1) 2x – 5 = 10

2x - 5 = 10

2x = 10 + 5

2x = 15

x = 15/2

x = 7,5

2) 4x – 5 = x + 8

4x - 5 = x + 8

4x - 5 - x = 8

3x - 5 = 8

3x = 8 + 5

3x = 13

x = 13/3

3) 12 + x = 5 – 5x

12 + x = 5 - 5x

12 + x + 5x =  5

12 + 6x = 5

6x = 5 - 12

6x = - 7

x = -7/6

4) 2x = 18

2x = 18

x = 18/2

x = 9

5) 7x = - 7

7x = - 7

x = -7/7

x = -1

6) 4x – 12 = 10

4x - 12 = 10

4x = 10 + 12

4x = 22

x = 22/4

x = 5,5

7) – x = - 17

- x = -17

-x = -17        *(-1)

x = 17

8) – 3x = 15

- 3x = 15

x = -15/3

x = -5

Answer 2

Opa, Vamos Lá!

1) 2x – 5 = 10 Resposta: →  $x=7,5$

2) 4x – 5 = x + 8 Resposta: → $x = 13/3$

3) 12 + x = 5 – 5x Resposta: → $x= -7/6$

4) 2x = 18 Resposta: → $x = 9$

5) 7x = - 7 Resposta: → $x = -1$

6) 4x – 12 = 10 Resposta: → $x = 5,5$

7) – x = - 17 Resposta: →  $x = 17$

8) – 3x = 15​ Resposta: → $x=-5$

Segue As Respostas Aí em Baixo! :)

1) 2x – 5 = 10

$2x - 5 = 10$

$2x = 10 + 5\\2x = 15\\x = 15/2\\x = 7,5$

2) 4x – 5 = x + 8

$4x - 5 = x + 8\\4x - 5 - x = 8\\3x - 5 = 8\\3x = 8 + 5\\3x = 13\\x = 13/3$

3) 12 + x = 5 – 5x

$12 + x = 5 - 5x12 + x + 5x = 512 + 6x = 56x = 5 - 126x = - 7x = -7/6$

4) 2x = 18

$2x = 18\\x = 18/2\\x = 9$

5) 7x = - 7

$7x = - 7\\x = -7/7\\x = -1$

6) 4x – 12 = 10

$4x - 12 = 104x = 10 + 124x = 22x = 22/4x = 5,5$

7) – x = - 17

$- x = -17-x = -17(-1)x = 17$

8) – 3x = 15

$- 3x = 15\\x = -15/3\\x = -5$

Bons Estudos!