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Math help.
http://theexiled.pwnageservers.com/forum/viewtopic.php?f=32&t=864		 Page 1 of 5
Author:  TE-Braveskin [ Wed Dec 14, 2005 8:23 pm ]
Post subject:  Math help.
this is hard for me. please dont laugh

x = 6y
y = x+2
x + z = 43

What does Z equal?
Author:  TE-Noxwizard [ Wed Dec 14, 2005 8:40 pm ]
Post subject: 
Systems of Equations.

First you need to get everything arranged the same.

0 = -1x + 6y + 0z
-2 = 1x - 1y + 0z
43 = 1x + 0y + 1z

Now, you need to get some of the terms to cancel out. Let's get rid of the y's first. Multiply the second row by 6.

0 = -1x + 6y + 0z
(6) -2 = 1x - 1y + 0z (6)
43 = 1x + 0y + 1z

Now it looks like this:

0 = -1x + 6y + 0z
-12 = 6x - 6y + 0z
43 = 1x + 0y + 1z

Now add the first two rows together.

0 = -1x + 6y + 0z
-12 = 6x - 6y + 0z
-12 = 5x + 0y +0z

Now do the same thing with your new row and the last row. Mulitply the second row by 5, then subtract.

-12 = 5x + 0y +0z
43 = 1x + 0y + 1z

I'd finish, but I have to go.
Author:  TE-Hammy [ Wed Dec 14, 2005 8:51 pm ]
Post subject: 
o.o umm... u ppl scares me... im in prealgebra

Quote:
Now, you need to get some of the terms to cancel out.
my math teachers all like "cancel cancel"
Author:  TE-Gooberman [ Wed Dec 14, 2005 10:07 pm ]
Post subject: 
im in algebra1 (going into geometry next year...hoping for an honors class) and i dont get much of that. and seeing as how my brain is sizzled from my rediculously pointless, boring and tedious science homework, i cant help much. sorry.
Author:  TE-Krogoth [ Thu Dec 15, 2005 8:31 am ]
Post subject: 
Whoa Nox, you made that a lot more complicated than you needed to.

If x=6y
then plugin x into the second equation to get y=6y+2
then you move the 6y to the other side to get -5y=2
then you divide the y by 5 and get y=-2/5
then plugin y into the first equation to get x, x=6(-2/5)
then plugin x into the last equation -12/5+z=43
move the -15 to the other side, and z=43+12/5

So:
x=12/5
y=2/5
z=45.2
Author:  TE-Hammy [ Thu Dec 15, 2005 9:27 am ]
Post subject: 
ya... that o.o
Author:  -$$-Agent D [ Thu Dec 15, 2005 5:44 pm ]
Post subject: 
I learned the same way as nox......
Author:  TE-Braveskin [ Thu Dec 15, 2005 11:25 pm ]
Post subject: 
Thanks for your help. But My homework was due ealier today and I just kinda guessed. lol, thanks anyways.
Author:  TE-Hammy [ Fri Dec 16, 2005 3:01 pm ]
Post subject: 
i bet they feel used .-. lol jk ;)
Author:  TE-Braveskin [ Fri Dec 16, 2005 5:32 pm ]
Post subject: 
I have a feeling they are working us too hard in 7th grade math. Yes, that is for my 7th grade math class.
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