anonymous
  • anonymous
What is the solution to the system of equations? -x+2y+2z=0 -x-27-2z=0 x -z=-1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
you really should start doing these by yourself...
anonymous
  • anonymous
i get it but i dont seem to get the last part?
anonymous
  • anonymous
last part? elaborate.

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anonymous
  • anonymous
-1 2 2 =0 -1 -2 -2 =0 1 0 -1 =1
anonymous
  • anonymous
wait. you have -27? in your question? is that meant to be -2y?
anonymous
  • anonymous
yeah im sorry -2y
anonymous
  • anonymous
your system should be -1 2 2 0 -1 -2 -2 0 1 0 -1 -1
anonymous
  • anonymous
using your calculator or some tedious row reducing by hand we get (x,y,z)=(,0,-1,1)
anonymous
  • anonymous
okay but how do you find or what do you do to find the answer for x,y, and z
anonymous
  • anonymous
alrighty. this is going to take a while to explain.
anonymous
  • anonymous
for any matrix we want to row reduce, we want to get this...
anonymous
  • anonymous
|dw:1370834971477:dw|
anonymous
  • anonymous
this is for a 2x2 matrix.
anonymous
  • anonymous
um, for a 3x3 matrix we want.
anonymous
  • anonymous
|dw:1370835048617:dw|
anonymous
  • anonymous
if your more experienced at row reducing you can use gauss-jordan elimination where..
anonymous
  • anonymous
|dw:1370835107277:dw|
anonymous
  • anonymous
what we are essentially doing here is called 'pivoting'
anonymous
  • anonymous
watch this http://www.youtube.com/watch?v=aQYuwatlWME
anonymous
  • anonymous
i gotta have lunch right now

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