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What is the value of ? (1)2x + 2y = 20 (2)x2 + xy = 100 – y2–xy

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What is the value of <img alt='images' src='https://www.fatskills.com/images3/gmat/c0296-01.jpg'/>? (1)2<em>x</em> + 2<em>y</em> = 20 (2)<em>x</em><sup>2</sup> + <em>xy</em> = 100 – <em>y</em><sup>2</sup>–<em>xy</em>






 
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