SOLUTION: Given A(1,-1), B(3,3), C(4,5). Prove that A,B,C are collinear. How do I prove this? I can't find any formula for this and the only thing I did was graphing the points. Can the gra

SOLUTION: Given A(1,-1), B(3,3), C(4,5). Prove that A,B,C are collinear. How do I prove this? I can't find any formula for this and the only thing I did was graphing the points. Can the gra

Algebra.Com

Question 146818: Given A(1,-1), B(3,3), C(4,5). Prove that A,B,C are collinear.
How do I prove this? I can't find any formula for this and the only thing I did was graphing the points. Can the graph prove this alone?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Find the equation of the line that goes through A and B. Now plug in the coordinates of point C to see if C falls on the line.
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