Respostas

2013-07-31T15:40:50-03:00
Xm=xa+xb/2

xm=2+2/2
xm=4/2
xm=2

xm= ya+yb/2

xm=2+4/2

xm=6/2
xm=3

8+2x+2y-4x+2y+4=0


-2x+4y+12=0

4y=2x-12

y=2x-12/4

y=x-6/2

y=x-3