Let's assume that a,b&c are in one straight line, so cannot form a triangle with each other. Now, total possible Triangle that can be formed choosing any 3 points without any colinear constraint is 8C3 = 56
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You need to simplify it first.

Use distribution

y=mx+b
m=slope
your slope is -4 :)
Answer:
Probably A?
Step-by-step explanation: