HOMEWORK (5 points)
1 2 0


(1) Consider the matrix A =−2 −1 −2 .


 0 −1 1 
−1
(a) Find A .
10
x − 2 y =

(b) Use part (a) to solve the linear system  2 x − y − z =
8 . (You MUST use part (a),
−2 y + z =
7

otherwise your solution will not be accepted.)
NOTE: Write your answer on a clean A4 size paper. Put your name and signiture on the paper.
Scan the paper using a mobile application, such as “CamScanner” or “Adobe Scan” or your
favourite one. Finally, convert it to a “pdf” file format and upload the file to “MicrosoftTeams”
before the due time.
ATTENTION! Do not send your file to the instructor directly. You MUST use the
“MicrosoftTeams” platform.