Menjawab:
# x = -1 # dan # y = 0 #
Penjelasan:
#warna (putih) (xx) x = y-1 #, # 2x + y = -2 #
#color (putih) xx2x + y = -2 <=> x = (- y-2) / 2 #
# => y-1 = (- y-2) / 2 #
# => warna (merah) (2xx) (y-1) = warna (merah) (2xx) (- y-2) / 2 #
# => 2y-2color (merah) (+ 2) = - y-2color (merah) (+ 2) #
# => y = 0 #
#warna (putih) (xx) x = y-1 #
#warna (putih) (xxx) = warna (biru) 0-1 #
#color (white) (xxx) = - 1 #