Homework Help: Algebra

Posted by Michael on Monday, November 7, 2011 at 7:12pm.

Use Cramer's Rule to solve each system of equations. a+b+5c=2
3a+b+2c=3
4a+2b-c=-3

Algebra - Steve, Tuesday, November 8, 2011 at 5:20am
D =
|1 1 5|
|3 1 2|
|4 2 -1| = 16

Dx =
|2 1 5|
|3 1 2|
|-3 2 -1| = 32

Dy =
|1 2 5|
|3 3 2|
|4 -3 -1| = -80

Dz =
|1 1 2|
|3 1 3|
|4 2 -3| = 16

So, the solution
(x,y,z) = (Dx/D, Dy/D, Dz/D) = (2,-5,1)

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