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Example Question #61 : Perpendicular Lines
What must be the slope of a line that is perpendicular to ?
Possible Answers:
Correct answer:
Explanation:
The equation is a vertical line, which means there is a zero denominator for the run. The slope is undefined for vertical lines.
The perpendicular line will intersect this equation with a ninety degree angle, which means that the line is rotated ninety degrees, and will form a horizontal line. Recall that the slopes of horizontal lines are zero.
The slope of a line perpendicular to is zero.
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