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-


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