Please consider the following two main clauses.
Both variables have the same range of values. Therefore, a 4:3 aspect ratio has been chosen.
I would like to combine these two main clauses into one sentence containing a main clause and a relative subclause like this:
Both variables have the same range of values why a 4:3 aspect ratio has been chosen.
Is this grammatically correct? I could not find an authoritive answer on the web. While this page mentions
why as a relative pronoun, it does not give an example. In contrast, Wikipedia does not mention it as relative pronoun at all.
If my second sentence is grammatically incorrect, could you suggest a way to rephrase it?