x is a-cross
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a vertical line at x=3
The x-intercept of a line is the point at which the line crosses the x-axis.
On the Cartesian plane the x line is the horizontal axis and the y line is the vertical axis.
5
The line x = 4 is a verticle line because, in a standard x-y graph, where x increases to the right and y increases upwards, the graph x = 4 is all points y, where x is 4. That is a verticle line, with infinite slope.