exam Maths Puzzle Numerical Ability

Determine whether or not the following points are collinear.
(1,9),(7,3), and (10,0)

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exam Other Question

the page is in back of the book page number 754. lesson 6-4 problem number 12. I am trying to help my daughter and I can't even find anywhere in the book on this. Im lost any help Subtract. Express your answer in simplest form. 4x/x-3 - 12/x-3