Answer
The slope is $52.7$ (pages) per (edition increment).
(For each new edition, the number of pages increases by about 53 pages.)
Work Step by Step
The unit of slope in
$y=mx+b$
is (unit of y) per (unit of x).
The slope is calculated as (change in y)/(change in x).
Here, $L=52.7n+486.3$
the slope is $52.7$ (pages) per (edition increment).
(For each new edition, the number of pages increases by about 53 pages.)
