Respostas

2014-05-24T15:51:27-03:00
Y=2x-8
2x-8=0
2x=8
x=8/2
x=4

y=4x+20
4x+20=0
4x=-20
x=-20/4
x=-5

y=2x-32
x-3=02
x=3
x=3/2
y=-x-9
-x=-9 .(-1)
x=9

y=-2x+10
-2x+10=0
-2x=-10
x=-10/-2
x=5