# Find the slope of a line that is perpendicular to a slope of 1

Find the slope of a line that is perpendicular to a slope of 1
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A slope that is perpendicular to another slope is the negative reciprocal.
(Turn it upside down and change the sign)
If two lines are perpendicular then:
${m}_{1}×{m}_{2}=-1$
For ${m}_{1}=1=\frac{1}{1},\to {m}_{2}=-\frac{1}{1}=-1$