I insist? Normally I do not insist. As for this one... it seemed not to be actual homework. I choose this time to believe he was checking his work.
And if he actually lied then I figure class will get quite a bit interesting if he doesn't actually learn how to work with equations.
Can I buy a vowel? If not, how about the first letter.
-edit-
I spent some time looking up Jake Hunter for some hints... I think it comes from Memories of the Past but I couldn't find anything that provided more info about the puzzle in that game.