Does my laptop have a single gpu or two?

Does my laptop have a single gpu or two?

Added (1). I recently bought a y510p from a private seller and am unsure whether this model has one or two gt 750's. I'm having trouble finding a second gpu on the device manager, nvidia control panel or GeForce panel, but i know this is a common problem for this laptop. I've tried installing previous drivers and updating my bios(to no avail) and can't get a second card showing, so i'm assuming it only has one card.
I'm running windows 8.1.

So how can i be sure this laptop has only one or two gpu's?

Added (2). MOBO has an intel 4600 series graphics card AND a Nvidia GeForce GT 750m, I know lenovo sells a model with only one gpu, but they also sell models with dual gt 750m's. It is a common problem for these laptops to not detect the second gpu with win 8.1

I don't know probably one or it uses native graphics on the mobo.

One

Who would I know please post pic of it.