Réponses

2013-03-26T20:02:50+01:00

x-3x=2

2x+7y=6

 

-2x=2

2x+7y=6

 

x= -1

2*(-1) + 7y = 6

 

x= -1

-2 +7y = 6

 

x= -1

7y = 8

 

x= -1

y= 8/7