anonymous
  • anonymous
Pre Calc help :( PLEAASSSEEEE
Mathematics
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
crap i remember doing this X| this is so going to kill me now because this part i understood let me think
anonymous
  • anonymous
eeek it's an emergency :(

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anonymous
  • anonymous
do you have notes for this showing how to do it?
anonymous
  • anonymous
i don't need 32
anonymous
  • anonymous
ahhhh im going to die trying to remember this is so easy too im thinking too hard
anonymous
  • anonymous
i am not able to open the file
anonymous
  • anonymous
how can I post it so you can see it?
anonymous
  • anonymous
can u post the question directly?
anonymous
  • anonymous
\[33. Find the values of x and y for which \left[\begin{matrix} 2y+5 \\ y-2 \end{matrix}\right] =\left[\begin{matrix} x-1 \\ 3x\end{matrix}\right] is true.\]
anonymous
  • anonymous
33. Find the values of x and y for which if you couldn't read that sorry
anonymous
  • anonymous
\[6x -4y=12\] \[y=\frac{3}{2}x-3\] \[m_{N}=-\frac{2}{3}\] \[m_{N}=-\frac{2}{k}\] Therefore k=3
anonymous
  • anonymous
Oops you don't need 32. Nvm.
anonymous
  • anonymous
I apologize :/ can you help with the others??
anonymous
  • anonymous
\[x-2y=6[1]\] \[3x-y=-2[2]\] \[[1]\times 3\] \[3(x-2y)=3(6)\] \[3x-6y=18[3]\] \[[2]-[3]\] \[(3x-y)-(3x-6y)=(-2)-(18)\] \[5y=-20\] \[y=-4\] Substitute the y-value (ie. -4) into any of the three equations above (ie. [1], [2], [3]) to find the x-value.
anonymous
  • anonymous
THANK YOU SO MUCH!!! 34??
anonymous
  • anonymous
I don't get the format of 34. That's a question foreign to me. What topic is that question from?
anonymous
  • anonymous
Is that absolute values?
anonymous
  • anonymous
i would assume its find the determinant of course i could be wrong
anonymous
  • anonymous
its to solve the matrix
anonymous
  • anonymous
you cant "solve" a matrix http://en.wikipedia.org/wiki/Determinant
anonymous
  • anonymous
I apologize!! it is to find the determinant
anonymous
  • anonymous
You don't need anyone's help with that. Just read the wiki page. It shows you what to add and subtract.
anonymous
  • anonymous
\[\left[\begin{matrix}a & b & c \\ d & e & f \\ g & h & i \end{matrix}\right]\] \[aei+bfg+cdh-ceg-bdi-afh\]

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