For the line passing through the points $(−2,1)$ and $(2,−11)$:

1. Calculate the slope of the line.

   Answer (a):

   $−3$

2. Find an equation of the line.

   Hint (b):

   Use the slope and one of the $(x,y)$ points you are given to solve for '$b$' in the equation $y=mx+b$.

   Answer (b):

   $y=−3x−5$