Respostas

2014-03-12T16:47:40-03:00
A)4x-5=2x+8
4x-2x=8+5
2x=13
X=13/2

B)-4x-6=5x-1
-4x-5x=-1+6
-9x=5
-x=5/9 (-1)
X=-5/9

C)5x-9=-x+4
5x+x=4+9
6x=13
X=13/6

D)-9+4x=-2x+6
4x+2x=6+9
6x=15
X=15/6=5/2
1 5 1
2014-03-12T16:55:30-03:00
A)4x-5=2x+8  
4x-2x=8+5
2x=13
x=13/2
x=6,5

B)-4x-6=5x-1
-4x-5x=-1+6
-9x=5
x=5/-9
x=-0,55556

C)5x-9=-x+4
5x+x=4-9
6x=5
x=5/6
x=0,833333...

D)-9+4x=2x+6
4x-2x=6+9
2x=15
x=15/2
x=7,5