exam Maths Puzzle Numerical Ability

I would like to get some help on these problems. Thank you for taking the time to help me out.

Find the slope of the line passing through the points (3,4) and (3,-4)

Graph 3

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exam Other Question

A pizza sells a 9 in diameter pizza for $8.00. What is a fiar price for a 13" diameter pizza? 6a/3xy + 2ab/5x^2y + 4b/2x^2 i tried to simplify this into a single fraction and came up with 60ax 12abx 60x^2y / 30x^2y lcd 30x^2y is this even close?