Réponses

2013-05-23T18:02:54+02:00
2013-05-23T18:10:58+02:00

A:-7x-2x=3-15

-9x=-12

x=-12/-9

x=4/3

B:6x-7x=3+10

-1x=13

x=13/-1

x=-13

C:4t+10t=4+3

14t=7

t=7/14

t=1/2

D:y+1=-3y+4

y+3y=4-1

4y=3

y=3/4