Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter. 
Definitions:
Allergy
An allergy is an immune system response to a foreign substance (allergen) that's not typically harmful to the body.
Nasal Discharge
A fluid flow from the nose, often as a result of colds, allergies, or infections.
Common Cold
A viral infectious disease of the upper respiratory tract characterized by symptoms like sneezing, coughing, sore throat, and runny nose.
Influenza
A highly contagious viral infection that attacks the respiratory system, commonly known as the flu, characterized by fever, cough, and muscle aches.
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