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Mathematics 10 Online
OpenStudy (anonymous):

Point X lines in plane M. Use postulate 5 and 9 to explain why there are at least two lines in plane M that contain point X.

Directrix (directrix):

Postulates numbered 5 and 9 have those numbers only in your text. They are not known universally as Postulates 5 and 9. Would you post what they are? Thanks.

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