Réponses

  • Utilisateur Brainly
2014-06-02T10:03:27+02:00
4x + 3y = 55
3x + 4y = 57

12x + 9y = 165
12x + 16y = 228

12x + 9y = 165
16y - 9y = 228 - 165

12x + 9y = 165
7y = 63

12x + 9y = 165
y = 9

12x + 9*9 = 165
y = 9

12x = 165 - 81
y = 9

12x = 84
y = 9

x = 7
y = 9

S= {7 ; 9}