1. The problem statement, all variables and given/known data The probability density function of X is f(x) = 2x, 0 < x < 1 Find the distribution function of X. 3. The attempt at a solution I just don't know what to do here. The book does something with Y and the change of variables and I don't understand why they were doing that. I had origionally thought that to do this problem I would just have to integrate the function??