Triangle PAT has been reflected over the X-axis, then the relationship between X- axis and line PP' will be that they are perpendicular to each other.
The line PP' is perpendicular the X-axis.
What is perpendicular?
Perpendicular lines are lines that intersect at a right (90 degrees) angle.
As it is seen by figure, if we join the point P to P'. Then it will cross the x-axis.
The line PP' will be the vertical line and the line of x- axis be horizontal line, which will corss each other at 90 degree.
i.e., they will be perpendicular to each other.
Therefore, the line PP' will be perpendicular to x -axis.
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