exam Maths Puzzle Numerical Ability

I can not find the correct answer to this one I got -5/1 for my answer. I need to find the slope of any line perpendicular to the line through points(0,5) (-3,-4)help me if you can.

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exam Other Question

Please help me with this problem (show your work)

( 7 x 10^3) x (8 x 10 ^-9)
how do I graph this?

x2 + y2 = 1