condi prob question, stuck

if f(x,y)=3 from 0<x<1, 0<y<x.

whats the conditional densiity function for fy(y|x<0.3)?

i try to use bayer theorm and marginal density, but couldn't solve it.


TS Contributor
Calculate the conditional CDF by definition of conditional probability, and then do differentiation to obtain the conditional pdf.