## samalami Group Title Pre Calc help :( PLEAASSSEEEE one year ago one year ago

1. samalami Group Title

2. kittykat96 Group Title

crap i remember doing this X| this is so going to kill me now because this part i understood let me think

3. samalami Group Title

eeek it's an emergency :(

4. kittykat96 Group Title

do you have notes for this showing how to do it?

5. samalami Group Title

i don't need 32

6. kittykat96 Group Title

ahhhh im going to die trying to remember this is so easy too im thinking too hard

7. nitz Group Title

i am not able to open the file

8. samalami Group Title

how can I post it so you can see it?

9. nitz Group Title

can u post the question directly?

10. samalami Group Title

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

11. samalami Group Title

33. Find the values of x and y for which if you couldn't read that sorry

12. Azteck Group Title

$6x -4y=12$ $y=\frac{3}{2}x-3$ $m_{N}=-\frac{2}{3}$ $m_{N}=-\frac{2}{k}$ Therefore k=3

13. Azteck Group Title

Oops you don't need 32. Nvm.

14. samalami Group Title

I apologize :/ can you help with the others??

15. Azteck Group Title

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

16. samalami Group Title

THANK YOU SO MUCH!!! 34??

17. Azteck Group Title

I don't get the format of 34. That's a question foreign to me. What topic is that question from?

18. Azteck Group Title

Is that absolute values?

19. completeidiot Group Title

i would assume its find the determinant of course i could be wrong

20. samalami Group Title

its to solve the matrix

21. completeidiot Group Title

you cant "solve" a matrix http://en.wikipedia.org/wiki/Determinant

22. samalami Group Title

I apologize!! it is to find the determinant

23. Azteck Group Title

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

24. Azteck Group Title

$\left[\begin{matrix}a & b & c \\ d & e & f \\ g & h & i \end{matrix}\right]$ $aei+bfg+cdh-ceg-bdi-afh$