Simple RAW for Pathfinder Thread VI: Return of the Red Die

[Draconi Redfir]

Q130: I recently picked up a Page of Spell Knowledge with the Shadow Projection spell on it for my Bard (12)/sorcerer (1) character

Would i actually be able to use it? My reasoning is that like scrolls and wands, my one sorcerer level means that the spell is still technically "on my spell list", and i'm able to cast 4th level spells due to my bard levels, so i still have 4th level spell-slots to cast from.

is that... legal? Or would i specifically need enough levels in sorcerer to get access to 4th level spell slots in order to cast it?

@V well nuts.