Question 1152457

 If the {{{x}}} value never changes a line is parallel to the {{{y}}}-axis. A line parallel to the {{{y}}}-axis is called a {{{vertical}}} line. 

line parallel to the {{{y}}}-axis is a line {{{x=a}}}

if passing through({{{5}}},{{{-7}}}), the equation of the line {{{x=5}}}

{{{drawing ( 600, 600, -10, 10, -10, 10,
circle(5,-7,.12), line(5,10,5,-10),locate(5,-7,p(5,-7)),
graph( 600, 600, -10, 10, -10, 10, 0)) }}}