The probability is really little because a shuffle will shuffle it in a mix order which makes it a really little chance for it to be in alphabetical order
This is easy! Just use the point-slope form:

Plug in the values:
-1 - 4 = m(2 - (-3))
Combine like terms
-5 = 5m
Divide both sides by 6
m = 5/-5 or
m = -1