Respostas

2014-04-29T11:17:10-03:00
Letra a : 

3x = 45
x = 45 / 3 
x = 15 

Letra b : 

5x - 3 = x + 13
5x -x = 13 + 3
4x = 16
x = 16 / 4
x = 4 

Letra c :

5x -10 = x - 2 
5x - x = -2 + 10
4x = 8
x = 8 / 4
x = 2 
2 3 2
2014-04-29T11:17:21-03:00
A) 3x=45
x = 45/3
x= 15

b) 5x-3=x+13
5x-x = 13+3
4x = 16
x = 16/4
x = 4

c) 5x-10=x-2 
5x - x = -2 + 10
4x = 8
x = 8/4
x = 2
1 2 1