Answer :

to find the slope do (y1-y2)/(x1-x2)
x1 does not means x^1 it means the first x
x2 does not means x^2, it means the 2nd x so

(x,y) format
y1=1
y2=6
x1=-2
x2=1
(1-6)/(-2-1)=-5/-3=5/3
slope=5/3