If the whine changes with load by swaying the car side to side, most likely a wheel bearing. Thing is there aren't any sure fire ways I know of to pinpoint it without removing the hub assembly and sometimes you can feel a little roughness if you rotate the bearing by hand after it is removed, not always though.
If the car has high miles on it may be prudent to change both of them because many times the one follows the other soon after the first side failure. I've tried to cheap out and have ended up replacing the second one within a month of the first one.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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