Posted by Anonymous on .
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?
4xy+z= 5
2x+2y+3z=10
5x2y+6z=1
 precal  Damon,

precal 
Damon,
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,
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,
Utube on how to find determinant of 3x3
http://www.youtube.com/watch?v=ROFcVgehEYA&feature=related 
whoops typo 
Damon,
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