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Concept

Negative Reciprocal

The negative reciprocal, or opposite reciprocal, of a number is its reciprocal with the opposite sign.

Number	Negative Reciprocal
$\frac{a}{b}$	$- \frac{b}{a}$
$2$	$- \frac{1}{2}$
$- \frac{5}{7}$	$\frac{7}{5}$
$- \frac{1}{4}$	$4$

The slopes of perpendicular lines are negative reciprocals of one another.

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