Question 978760
{{{drawing(300,300,-7,7,-7,7,grid(1),circle(0,3,0.2),circle(5,0,0.2),circle(0,-5,0.2),line(0,3,5,0),line(5,0,0,-5))}}}
Based on the information given, it looks like the remaining point should be at ({{{-a}}},{{{0}}})
{{{drawing(300,300,-7,7,-7,7,grid(1),circle(0,3,0.2),circle(5,0,0.2),circle(0,-5,0.2),line(0,3,5,0),line(5,0,0,-5),circle(-5,0,0.2),line(0,3,-5,0),line(0,-5,-5,0))}}}