exam Maths Puzzle Numerical Ability

I am trying understand this one problem

x-y when x is twice y and x =12
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exam Other Question

Find an equation of the circle of radius 4 that is tangent to both branches of the graph y=|x| Find the vertices and asymptotes of the hyperbola given by:

(x^2/25)-(y^2/100)=1

Thanks a lot for your help!!!!