Question

2) Resolva as equações abaixo; ( V= 6) a ) a – 21 = - a + 9 b) x – 3 = - 4x + 27 c ) 3a – 21 = 5a + 19 d) x +3 = -3x -17 e) a + 3 = 7a - 9 f) 7x – 33 = 3x + 27

Answer 1

Resposta:

a) a - 21 = - a + 9

a + a = 9 + 21

2a = 30

a = 30/2

a = 15

b) x – 3 = - 4x + 27

x + 4x = 27 + 3

5x = 30

x = 30/5

x = 6

c) 3a – 21 = 5a + 19

3a - 5a = 19 + 21

- 2a = 40

a = 40/-2

a = - 20

d) x +3 = -3x -17

x + 3x = - 17 - 3

4x = - 20

x = -20/4

x = - 5

e) a + 3 = 7a - 9

a - 7a = - 9 - 3

- 6a = - 12

a = -12/-6

a = 2

f) 7x – 33 = 3x + 27

7x - 3x = 27 + 33

4x = 60

x = 60/4

x = 15