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anonymous

  • one year ago

I just need someone to check my answers in using matrices to determine the coordinates of matrices.

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  1. anonymous
    • one year ago
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    http://prntscr.com/8g2uxw

  2. anonymous
    • one year ago
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    For both answers I got C. http://prntscr.com/8g2v9u

  3. LynFran
    • one year ago
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    for this 1...its A http://prntscr.com/8g2v9u

  4. anonymous
    • one year ago
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    Ah, that was my first assumption, but I second guessed myself.

  5. LynFran
    • one year ago
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    and for the other its A too

  6. LynFran
    • one year ago
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    we use the x axis matrix \[\left[\begin{matrix}1 & 0 \\ 0 & -1\end{matrix}\right]\]times it by each vertex to find solution of its it image

  7. LynFran
    • one year ago
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    the 270 degree matrix \[\left[\begin{matrix}0 & 1 \\ -1 & 0\end{matrix}\right]\]we do the same here too

  8. anonymous
    • one year ago
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    Thanks! I really appreciate your explanations because matrices have been giving me such a hard time.

  9. LynFran
    • one year ago
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    example with vertices V(8,4) and we want its image that was revolve 270 degree we multiply that by its matrix \[\left[\begin{matrix}0 & 1 \\ -1 & 0\end{matrix}\right]*\left(\begin{matrix}8 \\ 4\end{matrix}\right)\]\[\left(\begin{matrix}0*8+(-1)*4 \\ (-1)*8+0*4\end{matrix}\right)\]we get \[\left(\begin{matrix}-4 \\ -8\end{matrix}\right)\]as the image of V

  10. anonymous
    • one year ago
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    Ah, I see. Do you think you can help with scale factor with matrices as well?

  11. LynFran
    • one year ago
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    ok

  12. anonymous
    • one year ago
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    So this is my question. http://prntscr.com/8g302o I got A, but I was just guessing since the others didn't look right, but the points aren't exact, so it's kind of confusing.

  13. anonymous
    • one year ago
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    Actually I think it's this one! http://prntscr.com/8g30iv

  14. LynFran
    • one year ago
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    |dw:1442193863405:dw|

  15. LynFran
    • one year ago
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    ok so w(-1, 2).. z(-2, -4)...x(5,5)...y(5,3)

  16. LynFran
    • one year ago
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    its images is being multiple by 3

  17. LynFran
    • one year ago
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    so for image w we get 3(-1, 2) which give (-3, 6)

  18. anonymous
    • one year ago
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    Ahh, so that's how you multiply it, thanks a lot.

  19. LynFran
    • one year ago
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    yep|dw:1442194345221:dw|are the coordinates of image

  20. anonymous
    • one year ago
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    Okay, I understand now.

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