Odpowiedzi

2010-04-13T08:00:13+02:00
X+y=8
x-y =6

x=8-y
(8-y)-y=6

x=8-y
8-2y=6

x=8-y
-2y=-2

x=8-1
y=1

x=7
y=1

sprawdzenie:
7+1=8
7-1=6
2010-04-13T08:01:56+02:00
X+y=8
x-y =6

x=8-y
8-y-y=6

-2y=-2
x=8-y

y=1
x=7

7+1=8
7-1=6