Question

Classifique e resolva o sistema abaixo:

x+y+z=1
-x+y+z=3
2x-y+z=0

Answer 1

1+1+1+1+1
-1+1+1-1+1
+2-1+1-2+1
(+1-2-1)-(+2-1-1)
+1-2-1-2+1+1
-2