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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