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because, when you go, lets say, (2,3), and the line is on the 2, you change the second number, not the 2, but the 3.
The slope of a line is the ratio of rise over run. On a vertical line you have an infinite rise over zero run. Your slope would be infinity/0. As you know, you cannot divide by 0, so the slop is undefined.

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Q: Why do vertical lines have an undefined slope?
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Related questions

Do horizontal lines have an undefined slope?

No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.


Does everyline have a slope and y intercept?

No, vertical lines have an undefined slope.


What type of slope does vertical lines have?

a slope of zero. horizontal is undefined


Do vertical lines always have an undefined slope?

Yes.


What lines always have an undefined slope.?

Vertical lines always have an undefined slope. Slope for y = f(x) is given by :slope = dy/dxdx is zero at any point along a vertical line, making the slope undefined along a vertical line.


When is the product of the slope of two perpendicular lines not equal to -1?

When the lines are horizontal and vertical. (slope of zero) (undefined slope)


Is an undefined slope a vertical or horizontal line?

An undefined slope is vertical.


How many slopes do vertical lines have?

The slope of a vertical line is undefined. The slope of a horizontal line is 0. Hope this helps.


What is the direction of the line with an undefined slope?

A vertical line has an undefined slope.


What word describes the slope of the line passing through points (5 12) and (5 -13)?

It would be a undefined slope.There are four types of slope:Postive slope (when lines go uphill from left to right)Negative slope (when lines go downhill from left to right)Zero slope (when lines are horizontal)Undefined slope (when lines are vertical)


Can the graph of a linear functions have undefined slope?

Yes. For example, the lines x=7, x=-1, and x=145 all have an undefined slope; they are all vertical.


How do you make an equation with an undefined slope?

undefined slope is vertical. the equation of a vertical line is x=a , where a is the x intercept