well euh, like i told you, following me isn't such a great idea
i just tried everything, and repeated that 100 times lol
but the last time, i cleared entire memory, than did Y1=2X, pressed graph, got memory error (not enough) than i cleared ram again, did Y1=2X again, and than it worked..
the last Y1=2X isn't needed xp that was just to proove