Respostas

2014-07-25T23:21:58-03:00
a) x = 2
2x + 1 = 5
2x = 5 -1
2x = 4
x = 2

b) x = 3
- x + 4 = 7
-x = 7 - 4
-x = 3
x = 3

c) x = 0
- 2x + 5 = 5
- 2x = 5 - 5
- 2x = 0
x = 0

d) x = 3
3x - 1 = 8
3x = 8 + 1
3x = 9
x = 3

Espero ter ajudado!
1 5 1
2014-07-25T23:26:35-03:00
Olá, Jéssicaa12!

a) 2x + 1 = 5
2x = 5 - 1
2x = 4
x = 4/2
x = 2

b) - x + 4 = 7
-x = 7 - 4
-x = 3
x = 3

c) -2x + 5 = 5
-2x = 5 - 5
-2x = 0
x = 0 

d) 3x- 1 = 8
3x = 8 + 1
3x = 9
x = 9 / 3
x = 3