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Algebra 13 Online
OpenStudy (anonymous):

Two lines are perpendicular, and neither line is horizontal. Which of the following is not necessarily true of the lines?

OpenStudy (anonymous):

They gotta be straight. Fo' sho'.

OpenStudy (anonymous):

that they are perpendicular

Directrix (directrix):

One of the lines is vertical is not necessarily true.

OpenStudy (anonymous):

they are vertical. <-- not necessarily true

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