AIME15 Hardcore TMF user


Number of posts : 163 Age : 22 Location : Pleasanton, CA Registration date : 2008-08-13
 | Subject: Simple Systems of equations. Wed Aug 13, 2008 3:41 pm | |
| 3x+y=10 y=9
What is x?
Plug y=9 into the first equation to get:
3x+9=10
Subtract 9 from both sides and divide by 3:
x=1/3
Dojo, you need to install LaTeX on these servers
Last edited by AIME15 on Sun Aug 17, 2008 1:31 pm; edited 1 time in total |
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Dojo Admin


Number of posts : 154 Location : Probably somewhere near a computer Registration date : 2008-08-12
 | Subject: Re: Simple Systems of equations. Wed Aug 13, 2008 3:45 pm | |
| yeah yeah yeah I know, but i cant The web hoster Im using is going to install it soon, i hope I'll try. _________________ ~Dojo
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herefishyfishy1 Developer

Number of posts : 36 Age : 23 Location : An insignificant little blue-green planet 93 million miles from the sun Sol. Registration date : 2008-08-16
 | Subject: Re: Simple Systems of equations. Sun Aug 17, 2008 7:32 am | |
| - AIME15 wrote:
- 3x+y=10
y=9
What is x?
Plug y=9 into the first equation to get:
3x+9=10
Subtract 9 from both sides and divide by 3:
x=10/9.
Dojo, you need to install LaTeX on these servers
I'm sure you mean x=1/3. |
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AIME15 Hardcore TMF user


Number of posts : 163 Age : 22 Location : Pleasanton, CA Registration date : 2008-08-13
 | Subject: Re: Simple Systems of equations. Sun Aug 17, 2008 1:31 pm | |
| Thanks fishy. I swear i typed 1/3 the first time  |
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Dojo Admin


Number of posts : 154 Location : Probably somewhere near a computer Registration date : 2008-08-12
 | Subject: Re: Simple Systems of equations. Tue Aug 19, 2008 11:22 pm | |
| Hmm... You should make more questions here you dont just give the y variable. _________________ ~Dojo
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isabella2296 Admin

Number of posts : 45 Location : You'd really like to know, wouldn't you? Registration date : 2008-08-16
 | Subject: Re: Simple Systems of equations. Wed Aug 20, 2008 8:38 am | |
| Here's one:
John orders 15 books in total. Some are Math books and some are Fantasy books. Math books cost $30 dollars each and Fantasy books cost $12 each. The total price of the books is $306. How many Math books did he order? |
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herefishyfishy1 Developer

Number of posts : 36 Age : 23 Location : An insignificant little blue-green planet 93 million miles from the sun Sol. Registration date : 2008-08-16
 | Subject: Re: Simple Systems of equations. Wed Aug 20, 2008 9:00 am | |
| Solving with systems of equations:
x+y=15 30x+12y=306
12x+12y=180 18x=126 x=7 |
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 | Subject: Re: Simple Systems of equations.  | |
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