Question 984926


first, recall that vertical line is parallel to y-axis and  for any value of {{{y}}} the coordinate {{{x}}} is same

The x-coordinate of every point on the graph is {{{4}}}. Furthermore if a point in the plane is not on the graph then its x-coordinate is not {{{4}}}. Hence a point ({{{x}}},{{{y}}}) in the plane is on the graph if and only is {{{x = 6}}}. Thus the equation of the vertical line through ({{{4}}}, {{{1}}}) is

    {{{x = 4}}}

 {{{drawing( 600, 600, -10, 10, -10, 10,
line(4,10,4,-10),
 graph( 600, 600, -10, 10, -10, 10,0)) }}}