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Mathematics 19 Online
OpenStudy (anonymous):

help!! Which statement is true? i put D but my teacher said it wrong and it was non-existent what does mean?? A. All vertical lines have a slope of zero. B. All vertical lines have a positive slope. C. All vertical lines have a negative slope. D. All vertical lines have an undefined slope.

OpenStudy (wasiqss):

well what to say but i guess ur teacher is making a mistake

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