Respostas

2013-07-07T10:48:01-03:00
f(x)= ax+10
f(2)=20, então, 20 = 2a+10 => 2a = 20-10 => 2a = 10 => a = 10/2 = 5.
Logo, f(x) = 5x+10, Daí, f(-2) = 5(-2)+10 = -10+10 = 0

1 5 1