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Mathematics 7 Online
OpenStudy (anonymous):

write the equation of the line with slope undefined and containing the point (-3,1). A. y = 1 B. x = 1 C. y = -3 D. x = -3

OpenStudy (hoblos):

undefined slope---> then it is a vertical line passing by (-3,1) x = -3

Directrix (directrix):

D. x = -3 vertical line parallel to y-axis.

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