exam Maths Puzzle Numerical Ability

Hi May I have some help solving this problem?

Find a point on the y-axis that is equidistant from the points (8, -8) and (2, 2).

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exam Other Question

A line is located at (-5,0) and (-1,3).Where is the slope?
My answer;3/4

Thanks for all your help! Divide. Then simplify by taking roots, if possible. Assume that all expressions under radicals represent positive numbers.

root ( 3, 270a^7b^5 ) / root ( 3, 10a^5b^4 )