# $4.Iftheliney=\sqrt{3x}+ktouchesthecircle{x}^{2}+{y}^{2}=16,thenfindthevalueofK.\phantom{\rule{0ex}{0ex}}5.Findtheequationofthecirclewhosecentreis(2,2)andwhichpassesthroughthepoint(4,5).$

4 ) https://www.meritnation.com/ask-answer/question/if-the-line-y-3x-k-touches-the-circle-x2-y2-16-t/math/12099839

5 ) https://www.meritnation.com/ask-answer/question/find-the-equation-of-a-circle-with-centre-2-2-and-pa/conic-sections/6300090

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