Expert: Richard J. Raridon - 11/7/2007

Question
hello! I have a question, of course.

How do you solve:
x-2y-w=0
2x-y+z=1
-x+z+w=0
3y-z+w=2      using Cramer's rule?

Answer
I'm going to list them in order, w,x,y,z
the denominator, D =
|-1 1 -2 0|
|0  2 -1 1|
|1 -1  0 1|
|1  0 3 -1|
for W
|0  1 -2 0|
|1  2 -1 1|
|0 -1  0 1|
|2  0 3 -1|
then w = W/D
for X, replace the 2nd column, then x = X/D
for Y, replace the 3rd column, then y = Y/D
for Z, replace the 4th column, then z = Z/D