The slope of the line will be 0.
Firstly we know that in geometry parallel lines have the same slope (M1 = M2)
and perpendicular lines have the slop denoted by the formula
m1m2 = -1
x=1 is a vertical line aline that is perpendicular would be horizontal so, it would have a slope of zero.
Secondly,
x=1 is a line that is parallel to the y-axis has undefined slope and the slope of a line perpendicular to x=1 would be parallel to the x-axis has the slope of zero.
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