# Differential Equation, Substitution?

## Homework Statement

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

## 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.