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Spring 2020 Name: _________________________

MATH 175 – Test 2 - Part 2 (Show Your Work )

6. Let and . Find .

7. Let and . Find .

8. Let and . Find .

9. Solve by using the inverse of the coefficient matrix

10. Solve by using the inverse of the coefficient matrix

Hint:

1

6120

396

B

-

éù

=

êú

ëû

2

2

3

AB

-+

42

53

A

-

éù

=

êú

-

ëû

54

62

07

B

éù

êú

=-

êú

êú

ëû

BA

542

307

C

-

éù

=

êú

-

ëû

BC

312

211

xy

xy

+=-

ì

í

-=

î

518

336

3213

xyz

xyz

xyz

+-=-

ì

ï

-+=

í

ï

+-=-

î

154

036

A

-

éù

=

êú

ëû