1. 5×4; 9
2. ⎡⎣⎢⎢7−28−34−59315−12−9⎤⎦⎥⎥
3. ⎧⎩⎨⎪⎪4xx2x−++3y7y+z5z===−398
4. (10, 10, 0)
5. {(2, 3,−2)}
6. {(207+117z, 27+67z, z)}
7. A−B=⎡⎣⎢8411−180⎤⎦⎥
8. AB=[1]
9. The product AB is not defined.
10. [−61021404]
11. [20−9282986]
12. [102526]
13. ⎡⎣⎢⎢10−5414⎤⎦⎥⎥
14. ⎡⎣⎢−11852−1−17−5−3⎤⎦⎥
15. [5321][xy]=[3218]
16. {12x−2x−+3y7y==5−9
17. X=⎡⎣⎢⎢−35−325−1−1854−3⎤⎦⎥⎥
18. 12
19. 0
20. x=∣∣∣∣364−11311−2∣∣∣∣∣∣∣∣214−11311−2∣∣∣∣, y=∣∣∣∣21436411−2∣∣∣∣∣∣∣∣214−11311−2∣∣∣∣,
z=∣∣∣∣214−113364∣∣∣∣∣∣∣∣214−11311−2∣∣∣∣
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