Respostas

2013-11-17T19:47:26-02:00
(x1-x2)² + (y1-y2)²

(3-0)² + (4 - y)² = (1-0)² + (-2-y)²
9 + 16 -8y + y² = 1 + 4 + 4y + y²
25 -8y + y² -1 -4 -4y -y²
25 - 12y -5
20 - 12y = 0
-12y = -20 .(-1)
12 y = 20
y = 20/12
y = 10/6
y = 5/3

3 1 3