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Mathematics 16 Online
OpenStudy (anonymous):

.

Directrix (directrix):

The domain of the relation is the set of x-coordinates of the relation. {1, 3, -1, 0}

OpenStudy (anonymous):

it's just your x-coordinates.

OpenStudy (kymber):

The domain is all of the x-values, so all the first numbers in each pair.

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