What kind of slope do perpendicular lines have?

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Solution

Perpendicular lines: Two lines are perpendicular if they intersect each other at $90 °$ .
The slope of perpendicular lines:
The slope of the perpendicular line is the negative reciprocal.
The product of the slopes of the lines is $- 1$ .
If the slope of a line $l$ is $m_{1}$ and the slope of the line $m$ is $m_{2}$ and $l ⊥ m$ , then
$m_{1} m_{2} = - 1$

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