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Plotting to determine collinear

I plotted (0,-1),(3,5),(-1,-3) and determined that they were in fact  Collinear...just want to doublecheck
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(0,-1),(3,5),(-1,-3)
 
m1 = (-1-5)/(0-3) = 2
 
m2 = (-3-5)/(-1-3) = 2
 
Yep! They're collinear!