Réponses

2013-06-09T10:52:09+02:00

x + 4y = 14   /(*-1)

x + 11y = 35

 

-x-4y=-14

x+11y=35

-----------------

0+7y=21

 

7y=21

y=21/7=3

 

y=3

 

x+11y=35

x+11*3=35

x=35-33=2

 

x=2