Réponses

2013-01-31T15:53:42+01:00

5+4y+1=(6y+1)-(5y+3)

6 + 4y = 6y +1 -5y -3

6 + 4y = y -2

4y - y = -2 - 6

3y = -8

y = -8/3

 

(4y-6)-5(3y-1)=(5y-2)-(9y+20)

4y -6 -5*3y + 5 = 5y-2 - 9y-20

4y -6 -15y + 5 = -4y -22

-1 -11y = -4y -22

-11y + 4y =  -22 + 1

-7y  =  -21

7y  =  21

y  =  21/7

y = 3