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Old 19th January 2012, 06:44 AM   #1 (permalink)
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Simultaneous Equation

2x+5y=6
4x^2+16y^2=20x+4y-19

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Old 19th January 2012, 06:55 AM   #2 (permalink)
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Re: Simultaneous Equation

take the 1st simple equation and move the variables till you get x = ?y + ?

now you can substitute all the x in the 2nd equation with x = ?y + ?

now you will just have 1 variable to work with and solve for y.

once that is done, plug y value into 1st equation and solve for x.

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Last edited by workingtoohard; 19th January 2012 at 07:03 AM.
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Old 19th January 2012, 02:39 PM   #3 (permalink)
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Re: Simultaneous Equation

HI workingtoohard,

I tried but until the last stage where you need to use quadratic equation to solve, the answer becomes a decimal. Please help.

Thanks.

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Old 19th January 2012, 08:17 PM   #4 (permalink)
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Re: Simultaneous Equation

Okay...i have worked this out...lemme give you some hints...
x = 3 - 5/2y --(1)
:
: <---Some steps....do it yourself
:
(16y-5)(y+1)=0

y = 5/16 or -1

Substitute into the equation --(1)

x = 5 1/2 or 2 7/32

This question is quite elementary,you just need to sit down and slowly work this out!!


Simple and possible equation to use : ( (2b - sq rt(b^2-4ac)) /2a )

You need to work on your fundamentals. This is the typical kind of questions that present in E-maths.If you want to deal with higher level of maths, you would need a better and stronger foundation.


Last edited by Crizzs; 19th January 2012 at 11:58 PM.
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