One variation I still recall and I continue to use on soccer as well is:
Compute offensive avg = pf avg road team + pf avg home team
Compute defensive avg = pa avg road team + pa avg home team
Compare the offensive avg and the defensive avg with the total set by the bookie and take the biggest distance or difference if the odds are in your favour.
dal - den
Offensive avg = 97.4 + 109.4 = 206.8
Defensive avg = 99.7 + 99.8 = 199.5
Total set by the bookie = 206.5
Distance for offensive avg = 0.3
Distance for defensive avg = -7.0
We should pick the under.
I picked the good example this time...