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. © Algebra House
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