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samalami

  • 2 years ago

Pre Calc help :( PLEAASSSEEEE

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  1. samalami
    • 2 years ago
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  2. kittykat96
    • 2 years ago
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    crap i remember doing this X| this is so going to kill me now because this part i understood let me think

  3. samalami
    • 2 years ago
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    eeek it's an emergency :(

  4. kittykat96
    • 2 years ago
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    do you have notes for this showing how to do it?

  5. samalami
    • 2 years ago
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    i don't need 32

  6. kittykat96
    • 2 years ago
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    ahhhh im going to die trying to remember this is so easy too im thinking too hard

  7. nitz
    • 2 years ago
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    i am not able to open the file

  8. samalami
    • 2 years ago
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    how can I post it so you can see it?

  9. nitz
    • 2 years ago
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    can u post the question directly?

  10. samalami
    • 2 years ago
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    \[33. Find the values of x and y for which \left[\begin{matrix} 2y+5 \\ y-2 \end{matrix}\right] =\left[\begin{matrix} x-1 \\ 3x\end{matrix}\right] is true.\]

  11. samalami
    • 2 years ago
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    33. Find the values of x and y for which if you couldn't read that sorry

  12. Azteck
    • 2 years ago
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    \[6x -4y=12\] \[y=\frac{3}{2}x-3\] \[m_{N}=-\frac{2}{3}\] \[m_{N}=-\frac{2}{k}\] Therefore k=3

  13. Azteck
    • 2 years ago
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    Oops you don't need 32. Nvm.

  14. samalami
    • 2 years ago
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    I apologize :/ can you help with the others??

  15. Azteck
    • 2 years ago
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    \[x-2y=6[1]\] \[3x-y=-2[2]\] \[[1]\times 3\] \[3(x-2y)=3(6)\] \[3x-6y=18[3]\] \[[2]-[3]\] \[(3x-y)-(3x-6y)=(-2)-(18)\] \[5y=-20\] \[y=-4\] Substitute the y-value (ie. -4) into any of the three equations above (ie. [1], [2], [3]) to find the x-value.

  16. samalami
    • 2 years ago
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    THANK YOU SO MUCH!!! 34??

  17. Azteck
    • 2 years ago
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    I don't get the format of 34. That's a question foreign to me. What topic is that question from?

  18. Azteck
    • 2 years ago
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    Is that absolute values?

  19. completeidiot
    • 2 years ago
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    i would assume its find the determinant of course i could be wrong

  20. samalami
    • 2 years ago
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    its to solve the matrix

  21. completeidiot
    • 2 years ago
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    you cant "solve" a matrix http://en.wikipedia.org/wiki/Determinant

  22. samalami
    • 2 years ago
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    I apologize!! it is to find the determinant

  23. Azteck
    • 2 years ago
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    You don't need anyone's help with that. Just read the wiki page. It shows you what to add and subtract.

  24. Azteck
    • 2 years ago
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    \[\left[\begin{matrix}a & b & c \\ d & e & f \\ g & h & i \end{matrix}\right]\] \[aei+bfg+cdh-ceg-bdi-afh\]

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