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Mathematics 17 Online
OpenStudy (anonymous):

5. Is the line with equation x = 4 horizontal or vertical? What is the slope of this line?

OpenStudy (anonymous):

If x=4, you get your choice of any value for y. If you collect all such values of y, you get a vertical line. The slope equation has x1-x2 in the denominator, but that's always zero, so the slope is undefined.

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