Respostas

2012-12-07T00:00:41-02:00

a) 2x-1=3

2x=3+1

2x=4

x=4/2

x=2

 

b) 8x-12= 5x+3

8x-5x=3+12

3x=15

x=15/3

x=5

 

c)8x-4= 15x-6-5

8x-4= 15x-11

15x-8x=-4+11

7x= 7

x=7/7

x=1

 

d) x= 16/2

x=8

 

e)2x=8

x= 4

 

f)5x=10

x= 2

 

g)9x-6= 5+2x

7x=11

x=11/7

 

h)6y+13=31

6y=31-13

6y=18

y=3

2012-12-07T00:49:17-02:00

A)                            

2x-1=3

2x=3+1

2x=4

x=4/2

x=2

 

B) 8x-12=5x+3

8x-5x=3+12

3x=15

x=15/3

x=5