Respostas

2014-08-01T00:40:02-03:00
Letra a)
4 x - 1 = 11
4x = 11 + 1
4 × = 12
x = 3

Letra b )

2x + 2x = 8 + 12
4× = 20
× = 5

Letra c )
10 - × = - 2× + 6
+ 2× - × = + 6 - 10
× = -4

Letra D )
5× - 7× = 13 - 5
- 2× = 8 ( - 1)

2× = -8
× = -4

2014-08-01T00:40:50-03:00