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X doesn't have to equal to 4, it can be equal to any real number really (as in, not i), the really important part is that Y is equal to both Positive and Negative Infinity, just like in a horizontal line Y can be equal to any real number, but, in this case, X has to be equal to both Positive and Negative Infinity.
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Earn +20 ptsQ: Why is the line x equals 4 is a vertical line?
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Is X equals 4 is a vertical line?
No, it is horizontal.
Why is x equals equals 4 a vertical line?
That would be because all the graphed values of x are 4. So you can plug anything in for Y and it will still be on that vertical line.
What is the slope of a line that is perpendicular to x equals -4?
The line x = -4 is vertical, so a line that is perpendicular to it is horizontal, so its slope is 0.
What is the line for x equals 3?
a vertical line at x=3
Find the slope x equals -4?
That's a vertical line; the slope is not defined.
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