The slopes of perpendicular lines are reciprocals of each other.
For example. if one line had an equation like y= 2x+4 then the perpendicular's slope would be y=x/2+4 -- they are reciprocals of each other.
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Negative reciprocal slopes always represent perpendicular lines.
When the perpendicular lines are horizontal and vertical.
The slopes of two perpendicular lines are negative inverses of each other. In other words, the two slopes when multiplied together equal -1.
It is always -1.
Are perpendicular.