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Mathematics 21 Online
OpenStudy (anonymous):

Determine which relation is a function.

OpenStudy (anonymous):

Directrix (directrix):

If a relation is a function, then if you draw a vertical line through the graph of the relation, then you will pick up no more than one point of the graph.

Directrix (directrix):

Consider option C, a circle. The vertical line I drew picked up two points of the cirlce. So, the circle is NOT a function. It had the same x paired with two different y values. |dw:1416240753761:dw|

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