Respostas

2013-07-08T13:02:15-03:00
F(x)=ax + b 
f(0)=a.0+b
a.0+b=2
b=2

f(x)=ax+2
f(3)=a.3+2
a.3+2=7
a3=5
a=5/3

f(x)=(5/3).x+2