The line graph illustrates that 1 ml of blood alcohol is equivalent to around 2100 ml of breath alcohol. Additionally, 2 ml of blood alcohol is equivalent to a breath alcohol level of around 4500 ml. If you will analyze the graph, 3150 ml of breath alcohol is equivalent to 1.5 ml of blood alcohol.

B. 1.5 ml

A linear graph illustrates the relationship between two or more variables. In this case, it is the relationship between the blood alcohol concentration and the breath alcohol level.

C. Linear

98.6 degrees Fahrenheit is the average normal body temperature of an individual. The body temperature is directly proportional to the metabolic rate of a person. Therefore, an increase in body temperature can increase the metabolic rate of a person which increases the blood alcohol concentration in the body. In the given example, the temperature of the person is 97 degrees F, so it is less than the normal average temperature of the body. And a decrease in the body temperature can decrease the metabolism of alcohol in the body which results in a decrease in blood alcohol concentration, making the slope less than the slope from the given graph.

If the temperature of the person decreased to 97 degrees Fahrenheit, the slope would be less than the slope from the given graph.