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Mathematics 13 Online
OpenStudy (anonymous):

algebra

OpenStudy (anonymous):

OpenStudy (anonymous):

-1,3

Directrix (directrix):

Start at (0,0) and move one unit to the left to get under the point. Then, how many units do you have to move upward to get on point F? Look at the attached diagram. @EKKERKING

Directrix (directrix):

Let me see.

Directrix (directrix):

Yes. (-1,3) is correct. I think you are being asked for only the x coordinate, though. Check and see.

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