Review of straight lines Serum contaminant levels are often

Review of straight lines. Serum contaminant levels are often measured in concentrations of mass per deciliter of blood. We are tracking an environmental contaminant that is about 500 ng/dL for an average 16 year old and then accumulates at a rate of 100 ng/dL each year. The average concentration y after x years are given by the equation y=500 +100x

A.) After 20 years, what contamination levels will an average person have?

B.) If the accumulation was 200 ng/dL instead of 100 ng/dL each year, what is the equation that describes average serum contaminant accumulation after x years?

Solution

The average concentration y after x years are given by the equation y=500 +100x

(a) After 20 years, the contamination levels will an average person have

     x=20

    y=500 +100x

   y=500 +100(20)

   y=500+2000

   y=2500

The contamination levels will an average person have 2500

(b)

       The average concentration y after x years are given by the equation y=500 +100x

    If the accumulation was 200 ng/dL instead of 100 ng/dL each year, the equation that describes average serum contaminant accumulation after x years is

     y=500 +200x