exam Maths Puzzle Numerical Ability

Factor by grouping

6wx -2xy + 9bw - 3bx

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exam Other Question

How do I write the function of a line with the equation : y=6x+7 ?? Find the slope, if it exists of the line containing the pair of points
(2, 5) and (3, -9)
The slope m = ?
Will someone please help me with this I do not understand.