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).
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A line that is at right angles to a vertical line is said to be horizontal.
The slope of a vertical line is undefined. Horizontal slope is 0.
A vertical line.
The y axis on the Cartesian plane is a vertical number line
The slope of a vertical line would be parallel to the y axis.