document.write( "Question 1136604: Let X and Y represent continuous random variables. Let $\"f%28x%2Cy%29=%28xy%2F4%29\"$
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Algebra.Com's Answer #754387 by ikleyn(52847) $\"\"$ $\"About$

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document.write( "Density function, by the definition, is non-negative over its domain.\r\n" );
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document.write( "The given function f(x,y) is negative in QII and in QIV.\r\n" );
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document.write( "Therefore, it CAN NOT be a density function.\r\n" );
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