Book Maths Puzzle Co-ordinate geometry

How do you find the slope of (2,3) (7,6)

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Book Other Question

What is the vertex and the graph of y=6x2-4x-1 1. you can only use four fours to create 65, you can use any mathematical symbol necessary , but you can only use four fours as your digits.
2.find four #'s, the sum of which is