Respostas

2014-05-03T15:55:23-03:00
Resposta certa é a letra  e.( \/10 )/2 
2 5 2
r: x + 3y = 5 e s: x + 3y = 0

r: y = - (1/3)x + (5/3)

s: y = - (1/3)x

m = 3

( y-0) = 3*(x-0) => u: y = 3x

3x = - (1/3)x + (5/3) => x = 1/2 => y = 3/2 -> ( 1/2 , 3/2 )

(0, 0) e (1/2, 3/2):

d² = (1/2)² + (3/2)² = (1/4) + (9/4) = 10/4 => d = ( \/10 )/2