briefly summerize the scene in which animals confess to crimes. are the murders in line with old major's vision? why/ why not? why do the animals go along with it?

Grasdesaver has a complete and detailed summary of the confessions. You will find the direct link provided below.

http://www.gradesaver.com/animal-farm/study-guide/section7/

Old Major's vision of life after Farmer Jones was the exact opposite of what he'd put forth. The animals went along because anything they'd ever questioned had been rewritten.