boomerang285
Solve the matrix :
1 2 1 0 
0 1 02
0 0 1 3 



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technopanda13
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open study is for help not answers :)

boomerang285
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i know that, I am looking for help in solving this matrix

nubeer
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i think the person has just stated the question. maybe he needs help solving it

nubeer
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hmm @boomerang285 just want to know.. familiar with Guass jordan? is it related to it?

boomerang285
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yes I believe so, I am looking in my textbook, it is just very confusing

nubeer
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ok and you have to find x, y, and z right?

boomerang285
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yes

nubeer
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ok see your matrix.. all the elements below the peincipal diagnol are 0.. so you can apply Guass method.

boomerang285
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ok

nubeer
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ok so in guass u make equations like this.
just ignore the last column in you question and replace it with x,y ,zdw:1352480536058:dw

nubeer
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1x+2y+z = 0
y = 2
0x+0y+1z = 3
just now solve these equations

boomerang285
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so the answer is then (1, 2, 3) ? thats what i get

nubeer
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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

boomerang285
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thank you very much, i have a couple questions i need checked, are you willing?

nubeer
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yeah sure..

boomerang285
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these ones i have to solve using cramers rule, If you are familiar.
x2y=5
5xy=2
The answer for this one that I come up with is (1, 3)

boomerang285
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solve with cramers rule
2x9y=5
3x3y=11
i come up with (4, 1/3)

nubeer
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second one is right.

nubeer
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yup.. both of them are right :)

boomerang285
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thank you so much!

nubeer
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you are most welcome