1. The problem statement, all variables and given/known data Is the equation (x2sinx + 4y) dx + x dy=0 linear This problem also asks me to solve it, but I don't have a problem with that part. 2. Relevant equations An equation is linear if the function or its derivative are only raised to the first power and not multiplied by each other. 3. The attempt at a solution The answer in the back of the book says that it's linear with x as the dependent variable. I tried rearranging so that all x's were to the first power, but nothing doing. Is it a typo and it meant it's linear with y as the dependent variable? Because y is already by itself, and if you divide by dx then y' and y aren't multiplied by each other either so x2sinx + 4y =-x dy/dx Right? Have I mixed up dependent and independent somehow?