anonymous
  • anonymous
matrix 2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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anonymous
  • anonymous
ihatethisevenmoremore
anonymous
  • anonymous
it is not C

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anonymous
  • anonymous
this takes a bit but not too bad ready?
anonymous
  • anonymous
this is where you say "yeah i am ready even though i hate this even more"
anonymous
  • anonymous
yeah i am ready even though i hate this even more
anonymous
  • anonymous
ok the last line has 1, -2 which means \(z=-2\)
anonymous
  • anonymous
the second to last line has 1, 1, 3 which means \[y+z=3\] we know \(z=-2\) so \[y-2=3\]or \[y=5\]
anonymous
  • anonymous
the first line has 1, a, 2, 2 which means \[x+ay+2z=2\] we know \(y=5\) and \(z=-2\) so we have \[x+4a+2\times (-2)=2\] or \[x+5a-4=2\]
anonymous
  • anonymous
solve for \(a\) and get your answer you can do it or you want help?
anonymous
  • anonymous
oops i meant "solve for \(x\)"
anonymous
  • anonymous
its B? then
anonymous
  • anonymous
yeah B
anonymous
  • anonymous
okay 1 or 2 more then i promise ill let you go :'(
anonymous
  • anonymous
i have to say for someone starting out with matrices this is a dumb question but whatever
anonymous
  • anonymous
yeah i always stay up until 3 to help...
anonymous
  • anonymous
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anonymous
  • anonymous
I think its D?
anonymous
  • anonymous
@freckles this one is on you, i always screw this up
anonymous
  • anonymous
C is out
anonymous
  • anonymous
i mean matrix C is out
anonymous
  • anonymous
oh maybe not let me shut up
freckles
  • freckles
if we do a m by n times a n by k the we are cool because this will result in a m by k matrix you just have to make sure the inner numbers match if you know what I mean
freckles
  • freckles
|dw:1433573306445:dw|
anonymous
  • anonymous
so BA is ok right?
freckles
  • freckles
|dw:1433573324663:dw|
anonymous
  • anonymous
and CB?
anonymous
  • anonymous
okay so can CB not work or
anonymous
  • anonymous
CB ok [2,4][4,1] right?
anonymous
  • anonymous
oh wait so it's E then??
freckles
  • freckles
AB will not work since we have a 1 by 3 times a 4 by 1 3 is not 4 BA will work since we have a 4 by 1 times 1 by 3 1 is 1 CB will work 2 by 4 times 4 by 1 because 4 is 4
anonymous
  • anonymous
ok ok so LAST ONE
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anonymous
  • anonymous
cheat
anonymous
  • anonymous
otherwise this is total donkey work that takes like forever with very little bang for your buck it is for a machine, let the machine do it http://www.wolframalpha.com/input/?i=x-2y-z%3D2%2Cy%2B3z%3D1%2C2x-4y-3z%3D3
anonymous
  • anonymous
you got this?

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