Réponses

2013-05-28T22:27:19+02:00

a) 3x+ 7 = x +2 

 3x - x = -7 +2

2x = - 5

 

b ) 2 +2 y = -1 +3y 

2y-3y = -1 -2

-y = -3

 

c) 4- 5a = 2a- 1

 

5a-2a = -4-1

3a = -5

 

d) t- 4 = -3t-10

t +3t = -10 +4

2t = -6