Here is something I found that worked:
First you need to find the address of the method itself.
image lookup -v -F "-[ViewController myMethod:]"
in the result you will see a lot of info, but the range part will give you want you want
... range = [0x000708c0-0x00070c6c) ...
(where 0x000708c0 is address of method)
Now to add the given offset of 47, just use LLDB to do that math for you:
(lldb) p/x 0x000708c0 + 47
(int) $0 = 0x000708ef
and you get your answer, the offending line is on 0x000708ef
Or better yet, based on Jason Molenda's answer, is to just go straight to the code listing, which will show the line number:
(lldb) source list -a `0x000708c0 + 47`
EDIT: improved based on the answer from Jason Molenda
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