Alright, so...

I put sinx/70=sin40/46. so i got the answer x=78

but there are two answers? 102 and 78?

Someone explained to me that you subtract 78 from 180 for the second answer. But why do i do that? Do i ALWAYS do that? Or is it only in a certain case? And what case is it? How would I know when to subtract it from 180 for a second answer?

Sorry about the silly questions! I haven't really learned this stuff but I'm trying to study a little in advance during the summer.