These are negative reciprocals of each other; the product of these will equal -1.
Example: Above is a drawing of two perpendicular lines, if the slope of line AB is 2/3 and the slope of line CD is -3/2.

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Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.