The x co-ordinate of each point on a vertical line is the same. So pick two points with the same x coordinates and with y-coordinates as far apart as the scale allows and join them.
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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.
X has two lines that cross. Think of a-cross. X axis is horizontal on a coordinate plane. Y has a vertical line... the Y axis is the vertical on a coordinate plane.
The horizontal line on the coordinate plane is the x axis and is usually in the form of a number line that meets the vertical y axis number line perpendicularly at the point of origin which is at (0, 0)
That depends. How tough do you think it would be to draw a horizontal line or a slanting line on the wall ?