Respostas

2013-11-03T12:51:12-02:00
5x - 3y = 31
a) y = 3
5x - 3y = 31
5x- 3 . 3 = 31
5x = 31 + 9
x= 40 / 5
x= 8
b) x = 5
5x - 3y = 31
5 . 5 - 3y = 31
3y = 25 - 31
y= -6 / 3
y= - 2
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2013-11-03T12:54:15-02:00
A) 5x -3y = 31
5x - 3*3= 31
5x - 9 = 31
5x = 31 + 9
x = 40
     5
x = 8

B) 5x- 3y =31
5 * 5 -3y = 31
25 -3y = 31
-3y = 31 - 25
y = 
      -3
y = -2

 

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