anonymous
  • anonymous
Solve the matrix : |1 2 1| 0 | |0 1 0|-2| |0 0 1| 3 |
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
open study is for help not answers :)
anonymous
  • anonymous
i know that, I am looking for help in solving this matrix
nubeer
  • nubeer
i think the person has just stated the question. maybe he needs help solving it

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nubeer
  • nubeer
hmm @boomerang285 just want to know.. familiar with Guass jordan? is it related to it?
anonymous
  • anonymous
yes I believe so, I am looking in my textbook, it is just very confusing
nubeer
  • nubeer
ok and you have to find x, y, and z right?
anonymous
  • anonymous
yes
nubeer
  • nubeer
ok see your matrix.. all the elements below the peincipal diagnol are 0.. so you can apply Guass method.
anonymous
  • anonymous
ok
nubeer
  • nubeer
ok so in guass u make equations like this. just ignore the last column in you question and replace it with x,y ,z|dw:1352480536058:dw|
nubeer
  • nubeer
1x+2y+z = 0 y = -2 0x+0y+1z = 3 just now solve these equations
anonymous
  • anonymous
so the answer is then (1, -2, 3) ? thats what i get
nubeer
  • nubeer
yes .. that should be the answer.. you have to remmeber you can do like this just when you have all elements under principal diagonal are 0
anonymous
  • anonymous
thank you very much, i have a couple questions i need checked, are you willing?
nubeer
  • nubeer
yeah sure..
anonymous
  • anonymous
these ones i have to solve using cramers rule, If you are familiar. x-2y=5 5x-y=-2 The answer for this one that I come up with is (-1, -3)
anonymous
  • anonymous
solve with cramers rule 2x-9y=5 3x-3y=11 i come up with (4, 1/3)
nubeer
  • nubeer
second one is right.
nubeer
  • nubeer
yup.. both of them are right :)
anonymous
  • anonymous
thank you so much!
nubeer
  • nubeer
you are most welcome

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