BY inspection the two rvs are indep.
so where x>0
given that f(x,y) = exp (-(x+y)) for x>0 and y>0,
for any y>0, what is the conditional density function of X given that Y=y?
from how i see it, its the
marginal density of X divided by the the marginal density of X = 1
what is wrong with my reasoning? help is greatly appreciated.