# Transcribed Image Text: 27 Given the linest system of euations belows

Transcribed Image Text: 27 Given the linest system of euations belows

3-2 9

T+2-22 -5

2+2y-1 -2

Use Cramer ‘s rule and express the unknows ariabies, . y and a in terns of determinants, do

not solve for their exact values

1.

4.

-1

28. Evaluate

-1

01

0.

-2 Transcribed Image Text: Math 209. LIt

2 Let D and E be invertible n xn square iatrices. Then the inverse of DED I

A. D-ED

B. E-

C. D-E-D

D. DE- D-

23. Which of the following equations is nou-linear in the variables z, zz and z3.

A. 14r +5z2 +2 = 13

B. 12 = 2(V6 – 11) + I3

C. T2 = 2 – 673

D. +70x, – 17:r = 19

4 -3 170

0 0

0 -2 1

0 0

-2

1

24. Evaluate the determinant of matrix F =

-4

3

A. -12

B. 6

C. -18

D. 24

25. The systenı of linear equation

T1 – 2×2 + I = 0

2×2 – 8r3 = 8

-4x; + 5×2 + 9r3 = -9

has

28

A. a unique solution

B. infinitely many solutions

C. no solutio

D. none of the above

1 0

2 -1 3

26. Given the matrix A =

find A-

4 1

Okuere

-25-