Réponses

2013-05-21T17:02:01+02:00

Bonjour

 

3x + 2y = 66

x +3y = 57

 

3x + 2y = 66

-3x -9y = - 171

 

-7 y = -105

y = 105/7 = 15

 

x + 45 = 57

x = 57 -45

x =12

 

x/y = 12/15 = 4/5