Respostas

2014-04-09T11:40:46-03:00
2x+m, x=5 e m=3
2x5-3 = 10-3=7

x+y=10, x=-10 e y=-6
-10-6=-16

4a+3b, sendo a=5 e b=-5
4x5+3x(-5)
20-15 = 5