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corruptedskull is not online. corruptedskull
Joined: 25 Jun 2012
Total Posts: 21
20 Sep 2012 01:35 PM
You are given the following system of two equations:
x + 2y = 16 3x – 4y = –2

If you could help me with these I would appreciate it a lot because I'm completely lost on solving it.
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deatheater609 is not online. deatheater609
Joined: 06 Oct 2011
Total Posts: 2285
20 Sep 2012 01:35 PM
i had a D in this
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GTAkreuzer is not online. GTAkreuzer
Joined: 15 Jun 2012
Total Posts: 11356
20 Sep 2012 01:36 PM
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zoomzoom13 is not online. zoomzoom13
Joined: 05 Jul 2009
Total Posts: 1282
20 Sep 2012 01:37 PM
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Shadetastic is not online. Shadetastic
Joined: 10 May 2011
Total Posts: 18241
20 Sep 2012 01:38 PM
Simultaneous equations urk me.
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corruptedskull is not online. corruptedskull
Joined: 25 Jun 2012
Total Posts: 21
20 Sep 2012 01:44 PM
Thanks guys but so far no luck at solving it...
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SKULLMANDER is not online. SKULLMANDER
Joined: 13 Nov 2009
Total Posts: 11840
20 Sep 2012 01:54 PM
the answer is hats.
lots and lots of hats.
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Europeancow2 is not online. Europeancow2
Joined: 02 Aug 2009
Total Posts: 37979
20 Sep 2012 01:58 PM
x+2y=16
3x-4y=-2

use elimination method
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GTAkreuzer is not online. GTAkreuzer
Joined: 15 Jun 2012
Total Posts: 11356
20 Sep 2012 01:58 PM
[ Content Deleted ]
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corruptedskull is not online. corruptedskull
Joined: 25 Jun 2012
Total Posts: 21
20 Sep 2012 02:00 PM
All I know how to do is
x+ 2y = 16
-2y -2y

:(
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corruptedskull is not online. corruptedskull
Joined: 25 Jun 2012
Total Posts: 21
20 Sep 2012 02:00 PM
KhanAcademy didn't have anything useful.
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Europeancow2 is not online. Europeancow2
Joined: 02 Aug 2009
Total Posts: 37979
20 Sep 2012 02:01 PM
wat

no

there's two variables in that equation

you can't do that

you have the two equations

use elimination method

make one of the variables in one equation equal with another, then subtract

one of the variables should then be gone while all the other values are subtracted
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builder379 is not online. builder379
Joined: 26 Sep 2008
Total Posts: 1690
20 Sep 2012 02:09 PM
3x = 4y-2
x=2y+16

Therefore

3*(2y+16) = 4y-2

6y+48 = 4y-2

6y+50=4y

3y+25=2y

Therefore

3y-2y = 25

Therefore

y=25

Then

x = 50+16 = 66

Finally

y=25
x=66

Unless my math failz me, which it probably has :/

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Europeancow2 is not online. Europeancow2
Joined: 02 Aug 2009
Total Posts: 37979
20 Sep 2012 02:10 PM
erm

thats not right

plug it back in
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masterdylan1997 is not online. masterdylan1997
Joined: 19 Feb 2012
Total Posts: 443
20 Sep 2012 02:11 PM
Still completely lost on this...
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Europeancow2 is not online. Europeancow2
Joined: 02 Aug 2009
Total Posts: 37979
20 Sep 2012 02:12 PM
lazy nob

y = 5

x = 6
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builder379 is not online. builder379
Joined: 26 Sep 2008
Total Posts: 1690
20 Sep 2012 02:13 PM
x + 2y = 16 3x – 4y = –2


y=25
x=66


Let's test this

66 + 50 = 116 =/=16

198 - 200 = -2...

Well crud....

Something tells me this is a trap

Are you sure it's not 116?

Not 16?
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masterdylan1997 is not online. masterdylan1997
Joined: 19 Feb 2012
Total Posts: 443
20 Sep 2012 02:13 PM
Thank. (This is my main I didn't realize I was on that account when I posted)
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masterdylan1997 is not online. masterdylan1997
Joined: 19 Feb 2012
Total Posts: 443
20 Sep 2012 02:14 PM
well hmm still confused on the other questions but all this will help..
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builder379 is not online. builder379
Joined: 26 Sep 2008
Total Posts: 1690
20 Sep 2012 02:15 PM
Euro is right

Yupz
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Europeancow2 is not online. Europeancow2
Joined: 02 Aug 2009
Total Posts: 37979
20 Sep 2012 02:16 PM
x + 2y = 16
3x - 4y = -2

in order to make the elimination method work, you have to multiply one variable so its the same value as the the variable in the other equation. it will also affect the rest of the equation

(3)x + (3)2y = (3)16

also, you have to add everything, not subtract. therefore, the second equation has to be a negative.

-1(3x)+(-1)(-4y)=(-2)

simplified:

3x + 6y = 48
-3x + 4y = 2

you add it all up

10y = 50

divide by 10

y = 5

plug in y, find x

x = 6

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