Odpowiedzi

2010-04-08T19:16:31+02:00
{ x-2y=4
{ x+1=y /*(-1)
{x-2y=4
+{-x+y=1
y=5
2010-04-08T19:17:31+02:00
X-2y=4 //-x
-2y=4-x //:(-2)
y=4-x:(-2)