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 : 24
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 : 24
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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