Respostas

2013-12-12T17:50:11-02:00
A) 3x + 2y + z = 8
2x + 3y - z = - 3
x - y = 11
x = 11 + y

b) x+2y-3z=8
x= -2y+3z+8

c)4x + 2y - z = 
4(-1) + 2(-3) - (-2) = 
-4 - 6 + 2 = 
-10 + 2 = 
-8