Macmillan Learning The Department of Motor Vehicles warns of the effect of drinking alcohol on blood alcohol content (BAC, in volume). One "drink" is defined as 12 ounces (oz) of beer, or 4 oz of table wine, or 1.25 oz of 80-proof liquor. percent of For a woman weighing 120 pounds, BAC increases by 0.038, on average, for each drink taken in one hour. What is the equation of the regression line for predicting BAC from number of drinks for a 120-pound woman? BAC = 0.038 x number of drinks + 120 BAC = 0.038 x 0.023 x number of drinks BAC = 0.038 x number of drinks OBAC = 0.023 x number of drinks