When baking, if your oven can't reach the temperature stated in the recipe, do you then just adjust for time?

I have an oven that's rated to reach 200 degrees C (around 400-ish in F) (I can't put in higher temperatures on the device), but some recipes tell you to bake at higher temps than that. Does that mean that I can't bake that item in my oven, or can I just adjust for time?

Let's say the recipe says to bake at 225 degrees C for 25 minutes, I then bake it for 35 minutes at 200?

edit Thank you all for the answers, I'm going to try your suggestions and see if the recipe will allow for such an adjustment, and if not, I'll see if I can replace my crappy oven with a better one :)