Write the system in the form of a matrix equation. Do not solve. 
Definitions:
Epidemiological Studies
Research investigations that study the distribution, patterns, and determinants of health and disease conditions in defined populations.
Animal Testing
The use of non-human animals in experiments and research studies, often for the purpose of understanding human diseases, testing pharmaceuticals, or assessing safety.
New Chemicals
Substances that have been recently developed or synthesized.
Vaccines
Biological preparations that provide immunity to specific infectious diseases by stimulating the body’s defensive responses.
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