which of the following is a example of perpendicular lines

The correct option is D.
Important information:
Two lines are called perpendicular lines if the angle between those lines at the intersection point is 90 degrees.
In option A, the lines are parallel because they have the same direction and slope.
In option B, if we increase the lines, then they can not make a 90-degree angle.
In option C, the lines are not making a 90-degree angle.
In option D, the lines are perpendicular because they are making a 90-degree angle.
Therefore, the correct option is D.
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