Respostas

2014-08-24T02:08:47-03:00
A) t+21=6
t=6-21
t=-15

b)9=x+17
x=17-9
x=8

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

d) a-10=-b
a=-b+10
b=-a+10

e) 6x= 84
x= 84/6
x=14

f)x/7=77
x=77.7
x=539

g) -3x=27
x=27/-3
x=-9

h)2y/5=4
2y=20
y=20/2
y=10