Réponses

2013-09-15T18:50:01+02:00
2+2y=-1+3y                  
2y-3y=-1-2
-y=-3
y=3

4-5a=2a-1
-5a-2a=-1-4
-7a=-5
a=5/7



t-4=-3t-10
t+3t=-10+4
4t= -6
t=-6/4  t=-3/2
2013-09-15T18:50:25+02:00
2+2y = -1+3y
-3y + 2y = -1 - 2
-1a = -3
a = 3

4-5a = 2a-1
-2a - 5a = -4 - 1
-7a = -5
a =  \frac{5}{7}

t-4 = -3t-10
t + 3t = 4 - 10
4t = -6
t = -1,5