Réponses

2014-06-11T22:49:15+02:00
{-3x+7y=5
{4x-9y=6

4*{-3x+7y=5
3*{4x-9y=6

{-12x+28y=20
{12x-27y=18

28y-27y=20+18
y=38

-3x+7(38)=5
-3x=-266+5
-3x=-261
x=261/3
x=87
(87;38)


{5x+4y=11
6*{5x+4y=11 -5*{6x+5y=-5 30x+24y=66 -30x-25y=25 -y=66+25 y=-91 5x+(4*-91)=11 5x-364=11 5x=364+11 5x=375 x=375/5 x=75 (75;-91)