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9 Mar 2010 17:27:49 IST

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4x2+5y=6+20xy-25y2+2x;;;;7x-11y=17...plz solve,,..

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4x2+5y=6+20xy-25y2+2x;;;;7x-11y=17...plz solve,,..

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aal izz well

Blazing goIITian

Joined: 6 Jun 2009

Posts: 409

9 Mar 2010 18:14:20 IST

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arranging the given equation

4x^2+25y^2-20xy=6+2x-5y

(2x-5y)^2=6+(2x-5y)

in above eq. take 2x-5y=t

t^2-t-6=0

therefore we hve, t=3 and t=-2

2x-5y=3...eq.M.....and 2x-5y=-2-------eq.K

solving the above two equations with given eq. i.e., 7x-11y=17

we get answers as x=4 and y=1 from solving eq. eq.M and given eq.

and similarly u can find the other set of answers from eq.K and given eq,..

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