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Note 1. To find ratio , using k:1.
if k is positive , then divides internally.
if k is negative , then divides externally.
Note 2. Two points P(x₁,y₁) and Q(x₂,y₂) divides a line ax + by + c = 0 in the ratio :
-(ax₁ +by₁ + c)/(ax₂ +by₂ + c)
if ratio is negative : divide externally.
if ratio is positive : divide internally.