I suspect that, in most scenarios, the slope of a given line is more "meaningful" than the value of its y-intercept, yet the L.R. operation on the 15C returns the slope in the Y register.
(A criticism of this choice is made in "HP-15C: FIRST IMPRESSIONS OF AN HP-41 USER" attached by Gene Wright to Some 15c files from HHC 2010 recently.)
Is there a logical argument that can be used to defend the choice that HP made for the 15C? Perhaps it facilitates certain use cases?
Edited: 20 Sept 2011, 4:09 p.m. after one or more responses were posted