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 Simple Systems of equations.

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AIME15
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PostSubject: 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
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PostSubject: 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 Shocked
I'll try.

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herefishyfishy1
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PostSubject: 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
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PostSubject: Re: Simple Systems of equations.   Sun Aug 17, 2008 1:31 pm

Thanks fishy. I swear i typed 1/3 the first time Very Happy
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PostSubject: 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.

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isabella2296
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PostSubject: 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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PostSubject: 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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