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解一道大学概率题(联合分布)

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解一道大学概率题(联合分布)
关于X和Y的联合分布(joint distribution)概率函数f(x,y)=[e(-y)]/y 且0
确认为f(x,y)=[e(-y)]/y
解一道大学概率题(联合分布)
f(x,y)=[e(-y)]/y--------There is no x in the joint density function.
It can't be uniform distribution for X because the definition region of X is infinity. Please double check.