Question

Given y'' + xy' = 0, I tried using substitution (e.g. v = dy/dx = y') and solved using separation of variables. However, when I integrate that solution (e.g. v(x) = c*exp(-x^2/2)), I end up with something that looks like the error function (which is a definite integral). Also, only have one solution vice two necessary for 2nd ODE. How else can this be solved?