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What is the slope of a line that is parallel to the y-axis?
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undefined b/c it is a vertical line
The slope would be undefined because the y-axis is a vertical line.
Think about it this way: Slope is (y2-y1)/(x2-x1)
So if you have (2,5) and (2,6)
Then you have (6-5)/(2-2) = 1/0
Division by zero is undefined.
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