Question 959449


The slope of a {{{vertical}}} line is {{{undefined}}}.

So, the eguation of the line that has a slope {{{m}}} undefined and passes through ({{{4}}},{{{2}}}) is {{{x=4}}}.

{{{drawing( 600, 600, -10, 10, -10, 10,
line(4,-10,4,10),locate(4,2,p(4,2)),circle(4,2,.12),
 graph( 600, 600, -10, 10, -10, 10,0)) }}}