Answer:
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Step-by-step explanation:
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Answer:

Step-by-step explanation:




I am sure but I am going with Property if equation . this is say if x =2 then 2 x y = 2y .
Answer:

Step-by-step explanation:
(7 , -1) = (x1 , y1)
(9 , -9) = (x2 , y2)
distance formula = 
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