Respuestas

2012-09-22T01:47:58+02:00

2x+y=4

2x=4-y

x=4-y/2

 

3x-y=1

3x=1+y

x=1+y/3

 

x+2y=6

x=6-2y

 

2x-y=2

2x=2+y

x=2+y/2