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$1 = 1/2y - bx,$ $1 = 1/2x - ay$

I need x,y it in terms of constants, but I can't figure it out!

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Do you mean $(1/2)y$ or $1/(2y)$ (similar question for $1/2x$)? – David Mitra Dec 12 '12 at 15:38

From the 1st equation, $2+2bx = y$ Putting in the 2nd, $$1 = \frac12x - 2a-2abx\Leftrightarrow x=\frac{1+2a}{1/2-2ab}$$ if $ab\neq \frac14$. We also have $$y=2+\frac{1+2a}{1-4ab}$$ If $ab=\frac{1}{4}$, $$1 = \frac12x - 2a-2x=-\frac{1}{2}$$ which is impossible

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