anonymous
  • anonymous
when working with matrices, and performing row operations, how to i determine which equations to keep the same
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
it depends on what your trying to accomlish
amistre64
  • amistre64
you usually want to get it into the form of an identity matris 100 010 001
anonymous
  • anonymous
like if i am trying to get into ro-ecelon form. Sometimes in my book they say add 2*row three to row 2, producing a new row 2

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anonymous
  • anonymous
but why is it that we dont also get a new row 3
amistre64
  • amistre64
row echelon is just zeroing out the under on the pivots right?
anonymous
  • anonymous
right
amistre64
  • amistre64
the idea is to modify one row thru addition by using a useful form of the pivoting row; the pivoting row is already set so it doesnt need changed does it? in this case that would have been row 2
anonymous
  • anonymous
so in the case i mentioned above the row 2 is not changed because its the pivoting row, meaning we are adding it to row 3
anonymous
  • anonymous
thus producing a new row three, but keeping the original row 2
amistre64
  • amistre64
correct; changing row 2 at some later point is fiine; but for your problem its not needed to change
anonymous
  • anonymous
alright, thanks
amistre64
  • amistre64
youre welcome :)

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