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Simultanous equations


It seems somone on this server is very fond of procreational activites.I owuld have posted something in dediction but not allowed to post pornographic materail instead so ...

 

 

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Re-edited for clearing confusion.Danke Phantasm :)

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PHANTASM

Posted

ugh.. you lost me. And I'm kind of good with math... is this supposed to be funny?

F257

Posted

lol no i just had spare time to waste before whatever i wanted to watch on telly come :P Which part you lost on? I actually manged to learn this myself from some website a long time ago. Havent done it in ages but can work it out

F257

Posted

lol wait you can use this

 

http://www.hellam.net/algebra/simul1.html

 

its great :)

 

Ok look at

 

http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/simultaneoushirev1.shtml

 

_______________________________________________________________________________________

Its probaley clearer on the link but....

 

  Quote
Solve these simultaneous equations and find the values of x and y.

 

* Equation 1: 2x + y = 7

* Equation 2: 3x - y = 8

 

As you can see they are already in the format ax +by = c

 

And also the Y coefficent is already matched up. Since the two coeffiecentsa are different you need to add

 

  Quote
Add the two equations to eliminate the ys:

 

* 2x + y = 7

* 3x - y = 8

* ------------

* 5x = 15

* x = 3

 

 

Now you got x =3, put into equation 1 (as i state in the guide above, not in the link. its the same results either way but i like to double check)

 

Equation 1 ) 2x + y = 7

 

2 x 3 + y = 7

 

6 + y = 7

y=1

 

Equation 2 ) 3x - y = 8

 

3 x 3 - 1 = 8

 

It works so

 

X = 3, Y =1

F257

Posted

Scroll to the bottom an you 'll see they havent arranged

 

  Quote
Equation 1: y - 2x = 1

 

Equation 2: 2y - 3x = 5

 

Into the ax +by = c format but you can

 

  Quote
Equation 1: -2x +y = 1

 

Equation 2: -3x +2y = 5

 

Now if we multipoly equation 1 by 2 to make coefficent of Y to match up

 

  Quote
Equation 1: -4x +2y = 2

 

Equation 2: -3x +2y = 5

 

This comes to

 

 

  Quote
-x = -3

 

 

means

 

  Quote
x =3

 

aubstitue into equation 1

 

  Quote
Equation 1: 2 x 3 +y = 1

 

means

 

  Quote
6 + y = 1

 

rearange to

 

  Quote
6 + 1 = y

 

  Quote
y = 7

 

  Quote

 

Equation 2: -3x +2y = 5

 

to check this is correct put both y and x into equation 2

 

  Quote

 

Equation 2: -3 x 2 +2 x 7 = 5

 

x = 3 , y =7 . same results as the link

 

(lol sorry ran out of the number of quotes im allowed :P)

 

Lol i was only ever good on this part of the course ^^ Hopeless at the graphs/quadractic's

Baska

Posted

OMFG .... I always hate math... blehhh

F257

Posted

  Baska (PL) said:

OMFG .... I always hate math... blehhh

 

I loved maths so much i took sn A lelvel in it even though i got all Us in my exams :P

-=Medic=-

Posted

Oops Sorry i thought I'm still in f|a forum for games... OK got it so my browser didn't clean old forum cache I visited last time by accident and talking about math :huh:

vke

Posted

ROFL F25, i was sittin in math today, totally stuck on this, and i whipped out my laptop and started browsing the forums. Stumbled upon this gem, and now i understand!!!

 

God bless you =F|A= Priest :thanks

F257

Posted

  -=Medic=- said:

Oops Sorry i thought I'm still in f|a forum for games... OK got it so my browser didn't clean old forum cache I visited last time by accident and talking about math :huh:

 

lol well...maths can be fun :lol: And rofl val. Hope this works - dont blame me if it dosent, blame the BBC :P

Nik00

Posted

O_O what the hell xD this is so simple solved in an other way xD

 

2x = 6 - 4y

-3 - 3y = 4x

 

take first equation and fint the x --> x = 3 - 2y

 

then substitute in the other equation --> - 3 - 3y = 12 - 8y

 

solve --> 5y = 15 --> y = 3

 

substitute in first equation --> 2x = -6 --> x = -3

 

 

 

and that's done :D

 

 

i use that method only when i 've got to do whith harder equations, like in analytic geometry when u gotta find common points between two circumferences or parables like this:

 

x^2 + y^2 + 5x + 6y + 13

x^2 + y^2 + 12x + 7y + 2

 

in that way u can get rid of squared terms and find x & y :D

F257

Posted

  Nik00 said:

O_O what the hell xD this is so simple solved in an other way xD

 

2x = 6 - 4y

-3 - 3y = 4x

 

take first equation and fint the x --> x = 3 - 2y

 

then substitute in the other equation --> - 3 - 3y = 12 - 8y

 

solve --> 5y = 15 --> y = 3

 

substitute in first equation --> 2x = -6 --> x = -3

 

 

 

and that's done :D

 

i like being awkwared :D

Desu

Posted

lol, this is pretty easy

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