The average points for the visitor TEAM is calculated from the average of both, the visitor team points average and the home team visitor teams points allowed.

average_visitor=(average_visitor_team_score_as_visitor + average_home_team_score_from_visitor_TEAMS)/2);

The average points for the home TEAM is calculated from the average of both, the home team points average and the visitor team home teams points allowed.

average_home=(average_home_team_score_as_home + average_visitor_team_score_from_home_TEAMS)/2);

The points line is the difference of these two averages.

points_line=average_visitor - average_home;

The total points line is the sum of both averages.

total_points_line=average_visitor + average_home;

For example, the PREDICTION for the Los Angeles Lakers at Miami Heat: