Respostas

2013-11-19T16:57:32-02:00
A) x= 1 - y/2
5 (1 - y)/2 + 3y =7
5 - 5y/2 + 3y = 7
5 - 5y + 6y = 14
y= 14 -5
y= 9
 x= 1 - 9/2
x= -8/2
x= -4
b) m= 2 +3n
4(2 +3n) +2n= -1
8 + 12n + 2n= -1
14n= -1 - 8
14n= -9
n= -9/14
m= 2+3.(-9/14)
m= 2- 27/14
m= 28 -27/14
m= 1/14
1 5 1