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Q: Why the line x4 is a vertical line?

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yes

x=4

Because you have only given the point at which a line crosses the "x" axis. Since x = 4, we can draw it only vertically through (4,0).

Because X (which in this case is always 4) is the value of the horizontal axis so the only value that can change is Y, the verticle axis.

A vertical line!

A horizontal line is perpendicular to a vertical line.

It is a line that is vertical from a line segment or a intersecting line .

A horizontal line is a line perpendicular to the vertical.

A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.

all vertical lines are parallel to waht type of line?

x = 4 is the set of all points where the x coordinate = 4 On a number line, it's easy to graph. You simply place a dot on the number 4. When you extend that number line along the y axis, the dot extends, as well, into a line.

the slope of a vertical line is 0.

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