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Question 459225: Please help me solve this 4x4 matrix using cramer's rule
-x1-4x2+2x3+x4=-32
2x1-x2+7x3+9x4=14
-x1+x2+3x3+x4=11
x1-2x2+x3-4x4=-4
Answer by Edwin McCravy(20060)   (Show Source):
You can put this solution on YOUR website! Please help me solve this 4x4 matrix using cramer's rule
-x1-4x2+2x3+ x4=-32
2x1- x2+7x3+9x4= 14
-x1+ x2+3x3+ x4= 11
x1-2x2+ x3-4x4= -4
That is a system of equations, not a matrix.
Also, Cramer's rule involves determinants,
not matrices. To solve this by hand using
Cramer's rule with five 4x4 determinants would
take hours.
Here's the solution: x1=5, x2=8, x3=3, x4=-1
Tell us what way you're supposed to solve it
and we'll help you. Did you mean Gaussian
elimination?
Edwin
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