What is the slope of the line that passes through the points (2, -1) and (2,0)?

(2,-1),(2,0)

y2 - y1

-------- = slope

x2 - x1

0 - (-1)

--------- {substituted into slope formula}

2 - 2

1

--- {subtracted}

0

= undefined {it is impossible to divide a number by 0}

The slope is "undefined". Also, this would be a vertical line.

Horizontal lines have slopes of 0, such as 0/3.

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