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anonymous

  • one year ago

matrix 2

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    ihatethisevenmoremore

  3. anonymous
    • one year ago
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    it is not C

  4. anonymous
    • one year ago
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    this takes a bit but not too bad ready?

  5. anonymous
    • one year ago
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    this is where you say "yeah i am ready even though i hate this even more"

  6. anonymous
    • one year ago
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    yeah i am ready even though i hate this even more

  7. anonymous
    • one year ago
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    ok the last line has 1, -2 which means \(z=-2\)

  8. anonymous
    • one year ago
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    the second to last line has 1, 1, 3 which means \[y+z=3\] we know \(z=-2\) so \[y-2=3\]or \[y=5\]

  9. anonymous
    • one year ago
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    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 \[x+5a-4=2\]

  10. anonymous
    • one year ago
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    solve for \(a\) and get your answer you can do it or you want help?

  11. anonymous
    • one year ago
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    oops i meant "solve for \(x\)"

  12. anonymous
    • one year ago
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    its B? then

  13. anonymous
    • one year ago
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    yeah B

  14. anonymous
    • one year ago
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    okay 1 or 2 more then i promise ill let you go :'(

  15. anonymous
    • one year ago
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    i have to say for someone starting out with matrices this is a dumb question but whatever

  16. anonymous
    • one year ago
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    yeah i always stay up until 3 to help...

  17. anonymous
    • one year ago
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  18. anonymous
    • one year ago
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    I think its D?

  19. anonymous
    • one year ago
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    @freckles this one is on you, i always screw this up

  20. anonymous
    • one year ago
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    C is out

  21. anonymous
    • one year ago
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    i mean matrix C is out

  22. anonymous
    • one year ago
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    oh maybe not let me shut up

  23. freckles
    • one year ago
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    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

  24. freckles
    • one year ago
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    |dw:1433573306445:dw|

  25. anonymous
    • one year ago
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    so BA is ok right?

  26. freckles
    • one year ago
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    |dw:1433573324663:dw|

  27. anonymous
    • one year ago
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    and CB?

  28. anonymous
    • one year ago
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    okay so can CB not work or

  29. anonymous
    • one year ago
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    CB ok [2,4][4,1] right?

  30. anonymous
    • one year ago
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    oh wait so it's E then??

  31. freckles
    • one year ago
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    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

  32. anonymous
    • one year ago
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    ok ok so LAST ONE

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  33. anonymous
    • one year ago
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    cheat

  34. anonymous
    • one year ago
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    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

  35. anonymous
    • one year ago
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    you got this?

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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