SOLUTION: The points (2, -7) (-2, 1) and (8,K) are all on the same slope. How can I solve for the variable "K"? Thanks for your time and effort! :)

Question 971861: The points (2, -7) (-2, 1) and (8,K) are all on the same slope.
How can I solve for the variable "K"?
Thanks for your time and effort! :)
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
slope for first two is change in y/change in x
8-(-7)/-2-2
8/-4=-2
second and third must have a slope of -2
k-1/8-(-2)
(k-1)/10 equals -2
-20=k-1
k=-19
(8,-19)
first and third should be the same
-19-(-7)/8-2
-12/6 slope is -2

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