Solve the system by elimination, or by any convenient method. 
Definitions:
Mortality Rate
The measure of the number of deaths in a particular population, scaled to the size of that population, per unit of time.
J-Shaped Relationship
A statistical pattern where lower and higher amounts of a variable are associated with higher risks, and moderate amounts have the least risk, resembling a "J" on a graph.
Discrimination Coefficient
A measure used in statistics and econometrics to assess the degree of separation or differentiation between distinct groups or sets of data.
African Americans
An ethnic category in the United States comprising people with either complete or partial lineage from black racial groups in Africa.
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