Question 390543
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Hi
Line x = k is always a line parallel to the y-axis. 
that is, ALL y values have the identical x value. (couple examples below)
In this case x = 9/4  
{{{drawing(300,300,-6, 6, -6, 6, blue(line(2.25,10,2.25,-10)) ,grid(1),
circle(2.25,5,.3), circle(2.25, -3,.3),graph(300,300,-6, 6, -6, 6 ))}}}