Math (Alg 2)
posted by True .
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

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

Here is a link to Cramer's rule:
http://www.purplemath.com/modules/cramers.htm