Answer:
A line perpendicular to x=3 would be horizontal, with a slope of 0. y does not depend on x in a horizontal line: it is always the same value, regardless of x.
Explanation:
The equation for a straight line is y = mx + b, where m is the slope and b the y-intercept (the value of y when x=0). A line that is perpendicular to this line has a slope that is the negative inverse of m, which is -(1/m).
The line x=3 is a line that is perpendicular to the x axis. It has no slope and the b value is 0 (it does not cross the axis at x=0, since x is never 0. The equation is independent of y. It states that x is always 3, regardless of y.
This is plotted on the attached graph.
A perpendicular line has an undefined slope, since the Rise/Run of this line has a run of 0, for all values of y.
A line perpendicular to x=3 would be horizontal, with a slope of 0. y does not depend on x in a horizontal line: it is always the same value, regardless of x.
I can't make out the answer options. They appear to be cut off. Hopefully, the above information should guide one to the correct explanation.