Respostas

2013-12-11T19:11:58-02:00
A) 4x = 200
x = 200/4
x = 50

b) 5x = 450
x = 450/4
x = 90
1 5 1
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2013-12-11T19:13:30-02:00
A) 4x +200 = 0
4x = - 200
x = -200/4
x = -50

b) -5x - 450 = 0
- 5x = 450 multiplica por -1
5x = -450
x = -450/5
x = -90

2 5 2