Solve using the elimination method. If the system is inconsistent or dependent, so state. For a system with linear dependence, write the answer in terms of a parameter. For coincident dependence, state the solution in set notation. 
Definitions:
Alzheimer Disease
A gradually worsening disorder that leads to the degeneration of nerve cells, marked by a decline in memory, cognitive abilities, and alterations in personality.
Autopsy
A thorough examination of a deceased individual’s body by a pathologist to determine the cause of death or pathological conditions.
Neuritic Plaques
Accumulations of amyloid beta proteins found in the brain tissues of individuals with Alzheimer's disease, contributing to the pathology of the condition.
Cholinergic Cells
Cells that produce and release acetylcholine, a neurotransmitter involved in many functions including muscle contraction and memory.
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