Question 824655
{{{sqrt((x-4)^2+(y)^2)}}}
{{{sqrt(x^2-8x+16+y^2)}}}, distance to given point



{{{sqrt((x-1)^2+(y-y)^2)}}} 
{{{sqrt(x^2-2x+1)}}},distance to given line



{{{sqrt(x^2-8x+16+y^2)=2*sqrt(x^2-2x+1)}}}, according to description
{{{x^2-8x+16+y^2=4x^2-8x+4}}}
{{{16+y^2=3x^2+4}}}
{{{12+y^2=3x^2}}}
{{{3x^2-y^2=12}}}
{{{highlight(x^2/4-y^2/12=1)}}}