Respostas

2013-12-28T17:24:48-02:00
2x + 4y = 16
  x + y = 5

x = 5 - y
2 (5 - y) + 4y = 16
10 - 2y + 4y = 16
- 2y + 4y = 16 - 10
2y = 6
y = 6 ÷ 2
y = 3

x = 5 - y
x = 5 - 3
x = 2

Resposta: {2; 3}
1 5 1