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melanie
Contemplating the Berries
Age : 16
Joined : 20 Jun 2008
Posts : 771
 |  Subject: someone good at math..  Fri Jul 11, 2008 7:53 am | |
| please help me.
-x/3 - 5 =2x (-x/3 being -x over 3..)
my teacher said to multiply each by 3 to rid the fraction.
-x - 15 = 6x
solve for x.
wouldn't you add x to 6
and get -15 = 7x?
but that gives you some crazy decimal..
unless there's no solution.
idk.. it's too early for matematica. ><
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kitty
Holding Onto The Runes
Age : 95
Joined : 22 Sep 2007
Posts : 1347
Location : I'll tell you when they give me back my flashlight
| | Subject: Re: someone good at math.. Fri Jul 11, 2008 9:54 am | |
| Here:
-x/3 - 5 = 2x
3(-x/3) - 5 = 3(2x)
DO NOT TOUCH THE 5! It is clean!
You should then have
-x - 5 = 6x
-5 = 7x
-5/7 = 7x/7
(-) .7142857 [or (-)5/7] = x
I hope that helped.
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melanie
Contemplating the Berries
Age : 16
Joined : 20 Jun 2008
Posts : 771
| | Subject: Re: someone good at math.. Fri Jul 11, 2008 11:44 am | |
| that doesn't work when you plug it in for x, though.. does it?
and my I did it like that before,
my teacher said you have to multiply everything by 3.
idk.. maybe I'll just ask my brother when I see him tomorrow.
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kitty
Holding Onto The Runes
Age : 95
Joined : 22 Sep 2007
Posts : 1347
Location : I'll tell you when they give me back my flashlight
| | Subject: Re: someone good at math.. Fri Jul 11, 2008 11:51 am | |
| You only have to mutiply -x/3 and 2x by three. I swear. We did this last year in geometry and the year before that in Algebra 1.
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melanie
Contemplating the Berries
Age : 16
Joined : 20 Jun 2008
Posts : 771
| | Subject: Re: someone good at math.. Fri Jul 11, 2008 1:42 pm | |
| okay, thanks =D
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reader_meg
Going to Spence
Age : 17
Joined : 01 Jul 2008
Posts : 26
Location : Philly
| | Subject: Re: someone good at math.. Fri Jul 11, 2008 1:52 pm | |
| | You're on the right path. The answer would be -15/7. ( or -2.143 as a decimal) And you DO actually have to multiply the 5 by 3 too. Whatever you do to one term, you have to do to the rest. I checked it, when you plug -15/7 in it works. |
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melanie
Contemplating the Berries
Age : 16
Joined : 20 Jun 2008
Posts : 771
| | Subject: Re: someone good at math.. Fri Jul 11, 2008 1:59 pm | |
| oh, okay. thanks x2 =D
did I mention I dropped out of school for 3 years?
and I hate math.
XD
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kitty
Holding Onto The Runes
Age : 95
Joined : 22 Sep 2007
Posts : 1347
Location : I'll tell you when they give me back my flashlight
| | Subject: Re: someone good at math.. Sat Jul 12, 2008 3:35 pm | |
|  lol
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melanie
Contemplating the Berries
Age : 16
Joined : 20 Jun 2008
Posts : 771
| | Subject: Re: someone good at math.. Mon Jul 14, 2008 11:55 am | |
| >[
I think I just failed a test.
My teacher has to grade the essay questions, but I got one wrong because it's all "fill in the blank" and it's like, yaddayaddayadda a ___ test.
and I said line.
and the "correct answer" is vertical line.
>[
I'm mad at myself now.
roarrr.
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