Question 335422
Line perpendicular to {{{x=6}}} would have the form {{{y=a}}} where a is a constant. 
Use the point to determine a.
{{{highlight(y=7)}}}
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{{{drawing(300,300,-10,10,-10,10,grid(1),circle(2,7,.3),blue(line(6,-10,6,10)),graph(300,300,-10,10,-10,10,7,7))}}}