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4 Cards in this Set

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What are the steps for finding the determinant of
a 3 x 3 matrix?
Multiply each minor of the first column by the determinant of their respective 2 x 2 matrices. Use the sign array to place the appropriate sign in front of each of the factors and then add them up.
Can the determinant of a 3 x 3 matrix be found by expansion by minors about any row or column?
Yes. However, you must use alternating plus and minus signs proceeding the coefficients of the minors according to the sign array.
How does the sign array start?
+ - +
- + -
+ - +
How is Cramer's rule used to solve a system of 3 linear equations in three variables?
Just like normal, except you have to go through the extra step of finding the minors to find the determinants first.