Posted by True on Sunday, July 22, 2012 at 4:54pm.
The following expression represents the value of which variable in the solution of the system of equations below?
2 1 1
1 2 6
3 1 2
___________
2 1 2
1 2 3
3 1 1
2XY+Z=2
X+2Y+6Z=3
3XY+2Z=1
A. Z
B. Y
C. X
D. NONE OF THE VARIABLES ARE REPRESENTED

Math (Alg 2)  Damon, Sunday, July 22, 2012 at 5:08pm
You replace the third column in the NUMERATOR determinant with the right hand side, NOT THE DENOMINATOR to get the third variable, Z. Therefore you got 1/Z

Math (Alg 2)  Damon, Sunday, July 22, 2012 at 5:10pm
Here is a link to Cramer's rule:
http://www.purplemath.com/modules/cramers.htm
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