Réponses

2012-05-20T13:58:34+02:00

La 1er equation est:

2(x-4) = 3x-20

2x-8 = 3x-20

2x-3x = -20+8

-x = -12

x = 12

 

La 2e equation est:

2y-8(y+1) = 5y-(y-3)

2y-8y-8 = -5y+15y

2y-8y-15y = 8

-21y = 8

y = -2,625