Respostas

2013-12-04T20:18:45-02:00
 x e y são ângulos colaterais internos, logo são suplementares (x + y = 180°)

x - y = 64° (I)
x + y = 180 (II)

x = 64 + y (I)

(64 + y) + y = 180 (II)
             2y = 180 - 64
               y = 116/2
               y = 58°

               x = 64 + 58
               x = 122°


2 3 2
2013-12-04T20:21:44-02:00
 \left \{{{x - y=64} \atop {x + y =180}} \right.
x = 64 + y
____________________________________________
x + y = 180
64 + y + y = 180
2y = 180 - 64
2y = 116
y = 58
____________________________________________
x = 64 + y
x = 64 + 58
x = 122
1 1 1
Muito obrigada
de nada!!
It was a pleasure