Question

if (a,b) (c,d) and (a-c,b-d) are collinear then
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Answer 1

Answer:

I can't understand your question sorry

Answer 2

Answer:

because...

Step-by-step explanation:

a(d - b + d) + c(b - d) + (a - c)(b - d)=0

or -2add - ab - cd+ ab - bc - ad + cd = 0

or ad - bc = 0 or ab=cdab=cd