Réponses

2014-05-11T21:21:01+02:00
4x-y=1
4 x = y+1
y = 4 x-1

8x+2y=4
y = 2-4 x
2 (4 x+y) = 4

-x+10y=-1
y = x/10-1/10

2x+5=8
x = 3/2