Continuous random variables X and Y have joint PDF fx,y(x,y). Show that W = X-Y has PDF

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Continuous random variables X and Y have joint PDF fx,y(x,y). Show that W = X-Y has PDF
Continuous random variables X and Y have joint PDF fx,y(x,y).

Use a variable substitution to show

Continuous random variables X and Y have joint PDF fx,y(x,y).
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