Question 700557
an equation for the vertical line that contains point E({{{9}}},{{{-5}}}) is {{{x=9}}}

{{{drawing(600,600,   -10, 15, -10,10,locate(9,-5,E(9,-5)),circle(9,-5,0.2),  blue(line(9,10,9,-10)), grid(1),
graph( 600,600,   -10, 15, -10,10)) }}}