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 That's hard?

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PostSubject: That's hard?   Mon Dec 10, 2007 4:00 pm

Stance Punk wrote:
triginometry is hard.... I'll finish the homework in the morning....

3x+y=-20
y=2x

Find out what x and y is.
x = -4

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Lee
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PostSubject: Re: That's hard?   Mon Dec 10, 2007 4:21 pm

DUDE. ITIS HARD!!!!

I HAVE NO IDEA AT ALL HOW TO DO IT!!!!!
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PostSubject: Re: That's hard?   Mon Dec 10, 2007 6:33 pm

yep.

x=-4 and y=-8.

This is how it starts:

3x+y=-20

Since y is 2x, just replace the y with 2x. Now you have this:

3x+2x=-20

Combine the two x numbers and you get this:

5x=-20

Divide 5 by 5 and -20 by 5. Now you get this:

x=-4

That's the answer for x but now you need Y.
______________________________________________________


y=2x


Replace the x with -4

y=2(-4)

You multiply them and you get this answer:

y=-8


Here's what the final answer should look like:


{( -4,-8 )}

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PostSubject: Re: That's hard?   Thu Dec 13, 2007 11:48 am

wow. now i have a headache. LOL.
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