Parallel lines and proofs

Can anyone tell me how to find the value of x in this picture? http://img3.imageshack.us/img3/1103/40973099.jpg

I would also like some help in writing two-column proofs since I don't understand it at all... I would like some help with this problem http://img18.imageshack.us/img18/8045/98089481.jpg

I'm supposed to prove J is parallel to K

This is what I got for my columns

L ll n | given

Angle 12 is congruent to angle 8 | given

I just basically know how to write the given (Headbang)

If anyone helps me much appreciated! (Rofl)