anonymous
  • anonymous
How do I solve a system by using a matrix? The specific system I'm trying to solve is: 2x - 5y = 4 3x - 6y = 9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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zzr0ck3r
  • zzr0ck3r
|dw:1370656603723:dw|
zzr0ck3r
  • zzr0ck3r
do you see how this applies?
anonymous
  • anonymous
|dw:1370656686585:dw|

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anonymous
  • anonymous
Is that how I would multiply them?
anonymous
  • anonymous
Yes I see how it applies
zzr0ck3r
  • zzr0ck3r
ok multiply every number in the top ROW by -3/2 and then add each of those numbers to the number underthem
zzr0ck3r
  • zzr0ck3r
you will see why I choose these numbers when we are done
anonymous
  • anonymous
Wait.. so 2 * -3/2 and -5 * -3/2... which is -3 and 7.5, and then I add them to 3 and -6? 0 and 1.5?
zzr0ck3r
  • zzr0ck3r
there is actually quite allot to this, and you might want to read about it. Unless you just need to do it once...
zzr0ck3r
  • zzr0ck3r
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
zzr0ck3r
  • zzr0ck3r
try to understand that, its going to be hard for me to walk you through it.
anonymous
  • anonymous
I really only need to do it once lol, it's on a final and my last day of school is in a couple of days.
zzr0ck3r
  • zzr0ck3r
well that link will show you the exact steps for this problem
anonymous
  • anonymous
okay, thanks! (:
zzr0ck3r
  • zzr0ck3r
unless dpalnc has a better way of explaining it. There are many rules to what you can do ...and what changes what ...
anonymous
  • anonymous
hmm... isn't that process gaussian elimation??? the question said to use a matrix so just find the inverse of that coefficient matrix and multiply it by the [4, 9]
zzr0ck3r
  • zzr0ck3r
if hes asking how to row reduce im sure all that iis Chinese to him.
anonymous
  • anonymous
mandarin?
zzr0ck3r
  • zzr0ck3r
:)
anonymous
  • anonymous
haha...
anonymous
  • anonymous
I'm so confused now :c
zzr0ck3r
  • zzr0ck3r
can you just use substitution, or do you need to use a matrix?
anonymous
  • anonymous
@TammisaurusRex , forget what i said..
zzr0ck3r
  • zzr0ck3r
http://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/matrices_elimination/v/matrices--reduced-row-echelon-form-1 this would be a good place to go

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