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Omg! Solve please!
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Default Omg! Solve please! - 06-14-2013, 05:28 AM

This came up in my maths paper today, (X(sq)+Y(sq)=9 and X+Y=2) Solve to 3 decimal places. (Its a simultaneous Equation). If you can do this for me, you're GENIUS! Solve please (:

Possible answers:
X= Y= OR X= Y=

Also anyone who sat the Edexcel, 14th June 2013 A.M GCSE Paper, how did you find it?
- I wanted to cry on some of the questions (Like the one above) But others were easy ^.^



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Last edited by Poke Pk 12; 06-14-2013 at 05:49 AM.
  
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Default 06-14-2013, 05:46 AM

Well you have x^2 + y^2 = 9 and X + Y = 2... I don't think it's possible. If you take x^2 + y^2, square root both sides...

√x^2 + y^2 = √9

You get X + Y = 3
And you have X + Y = 2 on the other equation.




  
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Default 06-14-2013, 05:49 AM

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Originally Posted by IntellzJr View Post
Well you have x^2 + y^2 = 9 and X + Y = 2... I don't think it's possible. If you take x^2 + y^2, square root both sides...

√x^2 + y^2 = √9

You get X + Y = 3
And you have X + Y = 2 on the other equation.

I forgot to mention. X could have two possible answers, as would Y. Like this...
X= Y= OR X= Y=



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Default 06-14-2013, 05:56 AM

Quote:
Originally Posted by IntellzJr View Post
Well you have x^2 + y^2 = 9 and X + Y = 2... I don't think it's possible. If you take x^2 + y^2, square root both sides...

√x^2 + y^2 = √9

You get X + Y = 3
And you have X + Y = 2 on the other equation.
That breaks one of the basic rules of algebra. x^2 + y^2 = r^2 does not equal x+y=r.

OT: Did it on binder paper, sorry if it's a little hard to read. I used completing the square to solve it.



Edit: Lol it's sideways. One minute.



Last edited by Optimism; 06-14-2013 at 06:00 AM.
  
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Default 06-14-2013, 05:57 AM

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Originally Posted by Optimism View Post


That breaks one of the basic rules of algebra. x^2 + y^2 = r^2 does not equal x+y=r.

OT: Did it on binder paper, sorry if it's a little hard to read. I used completing the square to solve it.



Edit: Lol it's sideways. One minute.
Tell the person who wrote the paper that. I was suppose to be able to solve that within about 6 minutes.



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Default 06-14-2013, 05:59 AM

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Originally Posted by Poke Pk 12 View Post


Tell the person who wrote the paper that. I was suppose to be able to solve that within about 6 minutes.
I wrote it >.>

I did it in ~3 minutes. It's easy if you know what you're doing and have a calculator.

K, now it's cut off. Whatever, all the important parts are there.

Just wondering, what grade are you in?


  
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Default 06-14-2013, 06:00 AM

Quote:
Originally Posted by Optimism View Post


That breaks one of the basic rules of algebra. x^2 + y^2 = r^2 does not equal x+y=r.

OT: Did it on binder paper, sorry if it's a little hard to read. I used completing the square to solve it.



Edit: Lol it's sideways. One minute.
Oh damn, I was actually working it out like that too.

And yeah, I figured after I posted it that it was wrong. I'm running on no sleep right now haha. Thanks.




  
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Default 06-14-2013, 06:02 AM

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Originally Posted by Optimism View Post


I wrote it >.>

I did it in ~3 minutes. It's easy if you know what you're doing and have a calculator.
Oh... well, it does kinda make a lot more sense now. But what you did isn't taught on the spec we do, they expect everyone to be a mathematician?



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Default 06-14-2013, 06:03 AM

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Originally Posted by Poke Pk 12 View Post


Oh... well, it does kinda make a lot more sense now. But what you did isn't taught on the spec we do, they expect everyone to be a mathematician?
Not necessarily. Completing the square is a basic thing that they teach in Algebra. It's one of the most important things to remember as well. You'll need it for Trig later on.

And I got confused, I'm so used to using systems of equations and stuff to figure this out; I don't usually go in depth and use CTS in it.




  
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Default 06-14-2013, 06:04 AM

Quote:
Originally Posted by Optimism View Post


I wrote it >.>

I did it in ~3 minutes. It's easy if you know what you're doing and have a calculator.

K, now it's cut off. Whatever, all the important parts are there.

Just wondering, what grade are you in?
English School, so year 11. This is equivalent to whatever grade ages 15 - 16 is in. Have to remember also though, the specifications may be higher or lower dependent on your state.



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