Avoid Faculty Eyestrain

 

You can make your answer really hard to read if you use a #3 pencil.  Even with a dark pencil or a pen, erasing and/or crossing out can make quite a mess.  Unfortunately, some older professors are weary of eye strain and deduct points for illegible answers.  The message:  Use a pen or, at least, use a dark pencil.  If you have to make changes, draw a new diagram.