Hi,

A line passes through the points (p, a) and (p, –a) 

where p and a are real numbers and p ≠ 0

(p, a) and 

(p, –a)   m =   Cannot divide by ZERO, there is no slope to this Line.

slope of the line:  no slope (does not exist)

equation of the line:   x = p  Perpendicular Line

y-intercept: none

slope of a line perpendicular to the given line:  would be m = 0, horizontal Line y = 3, For example

See Lines x = 2 (Blue) and y = 3 (Green) on graph below



 

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