Odpowiedź: y = 1 x = 3 Wyjaśnienie: # x + y = 4 # --- (1) # 2x-y = 5 # --- (2) Od 1), # x + y = 4 # # x = 4-y # --- (3) Sub (3) do (2) # 2x-y = 5 # # 2 (4-y) -y = 5 # # 8-2y-y = 5 # # 8-3y = 5 # # 3 = 3 lata # # y = 1 # --- (4) Sub (4) do (3) # x = 4-y # # x = 4-1 # # x = 3 #
