Posted by **Anonymous** on Sunday, November 13, 2011 at 3:40pm.

okay, so I'm trying to figure out how to do this 3x3 matrix. I'm suppose to be finding the determent and using CRAMER'S RULE. Can someone please explain to me how to do this?

4x-y+z= -5

2x+2y+3z=10

5x-2y+6z=1

- precal -
**Damon**, Sunday, November 13, 2011 at 4:55pm
http://www.youtube.com/watch?v=taBHTo8sviM

- precal -
**Damon**, Sunday, November 13, 2011 at 5:01pm
first determinant calculator

http://www.wolframalpha.com/widgets/view.jsp?id=7fcb0a2c0f0f41d9f4454ac2d8ed7ad6

+4 -1 +1

+2 +2 +3

+5 -2 +6

determinant = D = 55

- precal -
**Damon**, Sunday, November 13, 2011 at 5:07pm
Now for x put right side in x column

+5 -1 +1

10 +2 +3

+1 -2 +6

determinant = Dx = 125

x = 125/55

You go ahead and do y and z

- precal -
**Damon**, Sunday, November 13, 2011 at 5:18pm
Utube on how to find determinant of 3x3

http://www.youtube.com/watch?v=ROFcVgehEYA&feature=related

- whoops typo -
**Damon**, Sunday, November 13, 2011 at 5:24pm
Now for x put right side in x column

-5 -1 +1 nope negative 5

10 +2 +3

+1 -2 +6

determinant = Dx = -55

x = -55/55

x = -1

You go ahead and do y and z

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