Odpowiedzi

2010-01-12T21:58:12+01:00
(X+Y)/2 = 15 |*(-2)
(X-2+Y/2)/2 = 10 |*2

-X-Y = -30
X-2 + 0,5Y = 20

-0,5Y = -8 |/(-0,5)
Y = 16

-X = -14|/-
X = 14