Svar: y = 1 x = 3 Forklaring: # X + y = 4 # --- (1) # 2x-y = 5 # --- (2) Fra (1), # X + y = 4 # # X = 4-y # --- (3) Sub (3) til (2) # 2x-y = 5 # # 2 (4-y) -y = 5 # # 8-2y-y = 5 # # 8-3y = 5 # # 3 = 3y # # Y = 1 # --- (4) Sub (4) til (3) # X = 4-y # # X = 4-1 # # X = 3 #
