Question 109642
The distance formula is 
{{{D^2=(x[1]-x[2])^2+(y[1]-y[2])^2}}}
{{{D^2=(-1-5)^2+(3-7)^2}}}
{{{D^2=36+16}}}
{{{D^2=52}}}
{{{D=7.2}}}
{{{drawing( 300, 300, -10, 10, -10, 10,grid( 1 ),circle( -1, 3, .2 ),circle( 5,7,.2 ),green(line( -1, 3, 5, 7)))}}}