Unlike other sports, the betting lines in the National Football League (NFL) are relatively simple. Typically a line is set with a plus or minus line to denote how much a team is favored or an underdog based on the game's expected score. A better bets whether or not a team will cover that line, which is to say exceed the number of points they are expected to win or lose by. So if a team is favored by 8 1/2 points, for a better to win, the team would have to win by nine or more points.
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