In a vertical line, all the x values will be the same. This means that all vertical lines will have the equation X=?
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The coordinate grid.
coordinate grid
a grid with each horizontal and vertical line numbered in order, starting at zero
The horizontal number line on a coordinate plane is called the x-axis, and the vertical number line on a coordinate plane is called the y-axis.
A vertical line in the xy coordinate plane would represent the line of an equation such as x = 1 or x = -4.