Math 1090
Quiz 3
February 23rd, 2015
Answer the following question in the space provided. The value of every
question is indicated at the beginning. Time: 12 minutes.
Name:
UID:
1. (20 points) Consider the following system of equations.
3x − 2y − 7z = 0
x−y−z =1
−x + 2y − 3z = a
Solve this system for a = −4 and write a one-sentence geometric interpretation of the
solution.
2. (Extra credit - 5 points) Solve the above system for a = 2 and write a one-sentence
geometric interpretation of the solution.
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