SOLUTION: A (-1,2), B (3,a) and C (-3,7) are collinear. Find a

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Question 976417: A (-1,2), B (3,a) and C (-3,7) are collinear. Find a
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
(1) Slope

(2) Slope Again but using point B



m=%287-2%29%2F%28-3-%28-1%29%29=5%2F-2=-5%2F2

m=-5%2F2=%287-a%29%2F%28-3-3%29

%287-a%29%2F%28-6%29=-5%2F2