anonymous
  • anonymous
Solve the system of equations. x + y - z = -1 x + y + z = 3 3x - 2y - z = -4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Luigi0210
  • Luigi0210
Matrices?
anonymous
  • anonymous
huh?
Luigi0210
  • Luigi0210
What method so you wanna use?

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Luigi0210
  • Luigi0210
*do
anonymous
  • anonymous
I tried elimination but I couldn't get it to work
uri
  • uri
Cramer's rule?
Luigi0210
  • Luigi0210
Sorry about that. The only way I know is matrices, it's like elimination but without variables
anonymous
  • anonymous
Well show me that way, I've never heard of it
anonymous
  • anonymous
So far I've got 10 is the determinant... if you use Cramers Rule you replace the first column with (-1, 3, -4) ... find the determinant of that... divide that determinant by your original which is 10. to get y repeat this menthod wit hthe second column
anonymous
  • anonymous
@Luigi0210 how do I do matrices
Luigi0210
  • Luigi0210
Have you seen this before: |dw:1377627725759:dw|
anonymous
  • anonymous
no
Luigi0210
  • Luigi0210
Okay, you know how with elimination you do row operations to eliminate variables?
anonymous
  • anonymous
yes
Luigi0210
  • Luigi0210
Well matrices is the same way, but as you see above in the picture it's just numbers you have to deal with.
Luigi0210
  • Luigi0210
The same way you would with elimination
Luigi0210
  • Luigi0210
Well here I'll get you started:
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