AIME15 Hardcore TMF user
Number of posts : 163 Age : 21 Location : Pleasanton, CA Registration date : 20080813
 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 

Dojo Admin
Number of posts : 154 Location : Probably somewhere near a computer Registration date : 20080812
 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


herefishyfishy1 Developer
Number of posts : 36 Age : 23 Location : An insignificant little bluegreen planet 93 million miles from the sun Sol. Registration date : 20080816
 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. 

AIME15 Hardcore TMF user
Number of posts : 163 Age : 21 Location : Pleasanton, CA Registration date : 20080813
 Subject: Re: Simple Systems of equations. Sun Aug 17, 2008 1:31 pm  
 Thanks fishy. I swear i typed 1/3 the first time 

Dojo Admin
Number of posts : 154 Location : Probably somewhere near a computer Registration date : 20080812
 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


isabella2296 Admin
Number of posts : 45 Location : You'd really like to know, wouldn't you? Registration date : 20080816
 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? 

herefishyfishy1 Developer
Number of posts : 36 Age : 23 Location : An insignificant little bluegreen planet 93 million miles from the sun Sol. Registration date : 20080816
 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.  
 
