Question 255306: Why is the line x=4 a vertical line?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Why is the line x=4 a vertical line?
Plot any two points points that satisfy
the condition.
Example: (4,-3),(4,2)
Draw a line thru the two points.
Notice that the line is vertical.
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Also, determine the slope of the line.
slope = (2--3)/(4-4) = 5/0 which is undefined
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Any line which has an undefined slope is vertical.
Any vertical line has an undefined slope.
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Any equation of the form y = k, where k is some number,
graphs as a vertical line.
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Cheers,
Stan H.
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