The Times’ NFL writer, Sam Farmer, examines this week’s matchups. Lines according to FanDuel Sportsbook (O/U = over/under). Last week’s record 9-6 (.600; season 125-83 (.601). Using point spreads with the scores Farmer predicted, the record against the spread last week would have been 10-4-1 (.714); season 102-101-5 (.502). All times Pacific. CHARGERS (5-8) at Las Vegas (5-8) Thursday, 5:20 p.m…