Ok, I have to solve this using a computer program but if someone can just explain the question to me that would be a start.

y'(t)=-20y+e^-t

Solve for 0£t£10 using the forward Euler with time-step 0.1, i.e. write the derivative in terms of y(t) and y(t+dt), with the time set to t on the right hand side, and solve y(t+dt) to set up the update scheme.

I've read up on the Euler's forward scheme but still don't understand what the question is asking or how to go about it!