Respostas

2014-04-15T21:01:39-03:00
7=-1a+b
1=2a+b (-1)
7=-1a
-1=-2a
6=-3a
a=6/-3
a=-2
7=-1.-2+b
7=2+b
-2+7=b
b=5
f(x)=-2x+5