Question

1. Resolva as seguintes equações : a)7x - 9 = 5 b) 4x - 5 = 5x + 1 c) 2x + 4 = 7x + 1 d) 4x + 2 = 38 e) 9x = 6x + 12 f) 5x - 1 = 3x + 11 g) 2x + 8 = x + 13 *

Answer 1

Resposta:

Explicação passo a passo:

1. Resolva as seguintes equações :

a)7x - 9 = 5

7x = 5+9

7x = 14

x = 14/7

x = 2

________________

b) 4x - 5 = 5x + 1

- 5 - 1 = 5x - 4x

- 6 = x

x = - 6

____________

c) 2x + 4 = 7x + 1

4 - 1 = 7x - 2x

3 = 5x

5x = 3

x = 3/5

____________

d) 4x + 2 = 38

4x = 38 - 2

4x = 36

x = 36/4

x = 9

___________

e) 9x = 6x + 12

9x - 6x = 12

3x = 12

x = 12/3

x = 4

___________

f) 5x - 1 = 3x + 11

5x - 3x = 11+1

2x = 12

x = 12/2

x = 6

_____________

g) 2x + 8 = x + 13

2x - x = 13 - 8

x = 5