Question

2) Resolva as equações.
a) 2x + 4 = 10
b) 4x – 12 = 20
c) 2x + 15 = 22 + x
d) 3x – 1 = 2x – 1
e) 4x + 2 = 14 - 2x​

Answer 1

Resposta:

x = 2

4x - 3 - x + 8 = 11

4x - x = 11 + 3 - 8

3x = 6

x = 6/3

x = 2

b) x = 4

6 . (x - 2) = 12

6x - 12 = 12

6x = 12 + 12

6x = 24

x = 24/6

x = 4

c) x = 2

9 + 2 . (5x - 4) = 21

9 + 10x - 8 = 21

10x = 21 + 8 - 9

10x = 20

x = 20/10

x = 2

d) x = 1

10x + 4 . (3 - 2x) - 6 = 8

10x + 12 - 8x - 6 = 8

10x - 8x = 8 - 12 + 6

2x = 2

x = 2/2

x = 1

e) x = 3

3 . (5 + 3x) + 5 . (-x - 1) = 22

15 + 9x - 5x - 5 = 22

9x - 5x = 22 + 5 - 15

4x = 12

x = 12/4

x = 3

f) x = 5

2 . (9x - 4) - 7 + (6 - 5x) . 3 = 18

18x - 8 - 7 + 18 - 15x = 18

18x - 15x = 18 + 8 + 7 - 18

3x = 15

x = 15/3

x = 5

explicaçâo: confia