Find the Slope

What is the slope of the line through (-2,1) and (2,-5) in the standard (x,y) coordinate plane?
A,)  3/2
B.)  1
C.)  -1
D.)  -3/2
E.)  -4

                                   rise          change in y           vertical change
 slope of a line  =  ------  =   ------------  =  --------------------
                                   run          change in x         horizontal change

Find the difference in the y-coordinates over the difference in the x-coordinates.

  -5 - 1
--------  =  slope   {subtracted y-coordinates over subtraction of x-coordinates}
 2 - (-2)

-6
----  =  slope   {subtracted}
 4

-3
---  =  slope   {reduced}
 2

D.)  -3/2

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