(a) Is it true that the determinant of a matrix is defined only if is a square matrix?
(b) Find the determinant of the matrix that you found in 10(a).
(c) Use Cramer’s Rule to solve the system in 10.
Whether the determinant of a matrix is defined only if is a square matrix.
If is an matrix, then the determinant of is obtained by multiplying each element of the first row by its cofactor and then adding the results.
Therefore, the determinant
The determinant of the matrix .
The solution of the system.
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