Réponses

2012-05-17T16:47:00+02:00

Tu as -9x+y = 2

Donc y = 9x+2

 

Tu as alors :

4x+2y = 4x + 2(9x+2) = 7

Donc 22x + 4 =7

D'où 22x = 3

x = 3/22

y = 9*(3/22) + 2

y = 27/22 + 44/22 = 71/22

 

FIN