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Write a pair of equation which has a unique solution x=2 and y=-3

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Given \ x=2 \ and \ y=-3\\we \ have \ to \ write \ pair \ of \ equation \ which \ has \ a \ unique \ solution \ x=2 \ and \ y=-3\\\\ x-y = 5 \ and \ 2x- y = 7\\\\ for \ unique \ solution \ we \ know \ that\\\\\frac{a1}{a2}\neq\frac{b1}{b2}\\\\putting \ value \ here \ to \ check \ it\\\\\frac{1}{-1} \neq \frac{2}{-1}=-1\neq-2\\\\Hence \ checked.

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