Question 1003377
You should find two of them.  Use the Distance Formula.


{{{sqrt((x-(-1))^2+(2x+1-(3))^2)=4}}}
{{{sqrt((x+1)^2+(2x-2)^2)=4}}}
{{{(x+1)^2+(2x-2)^2=4}}}
and you know what to do from here.



The resulting two points you should find are (1,3) and (-1/5, 3/5).