the equation of a line perpendicular to and passing through (, ) has to have a slope negative reciprocal of which is and anything divided by is undefined; so, the line is vertical
now we need to find the equation of a vertical line passing through (, )
So the perpendicular slope is undefined ()
since the unknown line goes through (, ), we can find the equation by plugging in this info into the point-slope formula
Point-Slope Formula:
.........vertical line
