1. The problem statement, all variables and given/known data Find the function satisfying the differential equation: dy/dx - 3y = 6e^(5x) with y(0) = -6 2. Relevant equations I believe this is Linear, so it is dy/dx + P(x)y = f(x) 3. The attempt at a solution I chose -3y to be P and used it to obtain integrating factor e^(-3x). I multiplied it though and ended up with d/dx(e^(-3x)y) = 6e^(2x) I integrated both sides and got e^(-3x)y = 3e^2x + C Solving for C gets me -9 so the satisfying function is y=e^(3x)(3e^(2x)-9) When I try to input this function into Webwork (online homework), it tells me it is incorrect and that the variable 'x' is not defined in this context. I wanted to make sure I am correct or if somehow, x comes out of this equation.