1. The problem statement, all variables and given/known data Find the particular solution to the differential equation (x + y - 4)dx - (3x - y - 4)dy = 0 that satisfies the initial condition y=1 when x=4 2. Relevant equations 3. The attempt at a solution It's not a homog. or equal D.E., therefore I think it's substitution. I don't really know how to get this problem started.