Help Me FAST ASAP

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Maniac
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Help Me FAST ASAP

Post by Maniac »

i know how to solve equations like
5x-2y=2
3x+2y=14


But how the hell do you solve this?
v + 2w -x + 2y + z = 2
-v - 2w + x + 2y +3z = 6
2v + 4w -3x + 2y = 3
-3v -6w + 2x + 3z = 9


the question say "Solve v, w, x, y, and z so it satisfies the equations above. There are infinitely many solutions."

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crazyskwrls
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Re: Help Me FAST ASAP

Post by crazyskwrls »

i guess substution would work but thats gonna take a while
set up a matrix and solve?

edit
or buy an ti-89 titanium :D

i'll try later maybe, too lazy
Last edited by crazyskwrls on Tue Sep 23, 2008 11:29 pm, edited 1 time in total.
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tedtwilliger
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Re: Help Me FAST ASAP

Post by tedtwilliger »

It been a long time since i've done algerbra but dont you use the quadreatic equation to solve those kind of questions?

edit: thats only for 3 unknownss, my bad >_<
Last edited by tedtwilliger on Tue Sep 23, 2008 11:31 pm, edited 1 time in total.

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Maniac
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Re: Help Me FAST ASAP

Post by Maniac »

tedtwilliger wrote:It been a long time since i've done algerbra but dont you use the quadreatic equation to solve those kind of questions?


demo pl0x?

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Squirt
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Re: Help Me FAST ASAP

Post by Squirt »

OOO Your screwed.
That takes a while....
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crazyskwrls
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Re: Help Me FAST ASAP

Post by crazyskwrls »

v=-2
w=1
x=-3
y=1
z=1

i did it really quick, didnt even check... wanna check it?

edit forgot z....
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M3K0S
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Re: Help Me FAST ASAP

Post by M3K0S »

the quadratic equation is used only for equations with a squared in one of the x's

example...
f(x)=x^2+2x+5

the quadratic equation is

x=-b+or- square root of b squared -4(a)(c) all divided by 2(a)

OT: lots of substitution would be my guess.... but im to lazy to help you with ur problem.. sry
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M3K0S
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Re: Help Me FAST ASAP

Post by M3K0S »

crazyskwrls wrote:v=-2
w=1
x=-3
y=1
z=1

i did it really quick, didnt even check... wanna check it?

edit forgot z....


sry for double post... but fack you nerd.... xD
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crazyskwrls
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Re: Help Me FAST ASAP

Post by crazyskwrls »

M3K0S wrote:
crazyskwrls wrote:v=-2
w=1
x=-3
y=1
z=1

i did it really quick, didnt even check... wanna check it?

edit forgot z....


sry for double post... but fack you nerd.... xD


o well it was completely wrong anyways :(
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Squirt
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Re: Help Me FAST ASAP

Post by Squirt »

Actually I need quick help forgot something.
How do you adda whole number and a fraction?
like

1+ 3/4?
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M3K0S
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Re: Help Me FAST ASAP

Post by M3K0S »

wtf hahah its either 1 3/4 or u make the 1 a fraction which makes it 4/4 + 3/4 then its 7/4

so 1 3/4 or 7/4... ur choice....
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Maniac
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Re: Help Me FAST ASAP

Post by Maniac »

M3K0S wrote:
crazyskwrls wrote:v=-2
w=1
x=-3
y=1
z=1

i did it really quick, didnt even check... wanna check it?

edit forgot z....


sry for double post... but fack you nerd.... xD


The solution dont satisify the first question: v + 2w -x + 2y + z = 2 :(

so theres no need to check the remainding eqns

there must be someone that plays SRO that knows how to solve this?
Last edited by Maniac on Tue Sep 23, 2008 11:43 pm, edited 1 time in total.

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crazyskwrls
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Re: Help Me FAST ASAP

Post by crazyskwrls »

i am a genius

v=-10
w=4
x=-3
y=-1
z=3
:D
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Squirt
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Re: Help Me FAST ASAP

Post by Squirt »

How about 2 + 5/9 !
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Maniac
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Re: Help Me FAST ASAP

Post by Maniac »

crazyskwrls wrote:i am a genius

v=-10
w=4
x=-3
y=-1
z=3
:D



explaination/show work pl0x or did you do this on your "ti-89 titanium"?

the paper is asking me for 3 possible solutions :(

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Barotix
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Re: Help Me FAST ASAP

Post by Barotix »

Squirt wrote:How about 2 + 5/9 !


same method. I dislike fractions.

2 + 5/9
2/1 + 5/9
2/1(9/9) + 5/9
18/9 + 5/9
23/9

Showed every step so you can understand what I did. Pay attention in class.
Maddening
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Ilove2quack
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Re: Help Me FAST ASAP

Post by Ilove2quack »

Maniac wrote:i know how to solve equations like
5x-2y=2
3x+2y=14


But how the hell do you solve this?
v + 2w -x + 2y + z = 2
-v - 2w + x + 2y +3z = 6
2v + 4w -3x + 2y = 3
-3v -6w + 2x + 3z = 9


the question say "Solve v, w, x, y, and z so it satisfies the equations above. There are infinitely many solutions."




v + 2w -x + 2y + z = 2
-v - 2w + x + 2y +3z = 6
+
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
4y+4z=8

This tell you anything?

Do the same with the 3rd and 4th equation, use the first one get rid of some unknowns.
Notice you can multiply the first one with -2 and 3, and add it with equations 2 and 3.

In the end there will be 3 equations:
4y+4z=8
x-2y=-1
-x+6y+6z=15

Much more easy to solve than the first ones. I got y=-1(lazy to do the rest).
With x y z found use the original equations to get w and v.
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Kraq
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Re: Help Me FAST ASAP

Post by Kraq »

Combine like terms

Edit: Nevermind didn't examine the equations.
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