exam Maths Puzzle Numerical Ability

(2,5)and (2,-9)
Find the slope if it exists of the line containing the pair of points.
Help me with this one please.

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exam Other Question

how do i find the measurement of a vertical angle for exercise 16 and 17 find the length x and y (every angle on each block is a right angle)
number 16 and 17. I really need help on how to do these

Thanks for you help in adv