Hooking up a Numark Mixtrack Pro 2 to the Pioneer DDJ-SX

Hi! I'm new to the forum. I'm a beginner dj, I would like to know how can I hook up my Numark Mixtrack Pro 2 and my laptop to the Pioneer DDJ-SX controller. I have a friend that has the DDJ-SX with Serato DJ. I have a laptop computer also with Serato Dj. I would like to use my computer to dj through the DDJ-SX and his speakers system. The reason I would like to use my computer is because of the variety of songs.

Dj Mc

Put your master out through one of his channels (channel 4 preferably, so you can keep 1 open on the SX for the mic and 2 & 3 for his mixing), put it on CD on the front of the SX and put the volume fader up. There you go! It will even play your music when the S has no laptop connected.

I'll take my Mixtrack Pro 2 over my friends this weekend and try this hookup. Thanks>