It's called an ORDINATE.
when there is a straight line 100% parallel to the x axis, it's slope is 0.
If a line is parallel to the y axis, its slope is undefined, or infinite.
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x = negative 1 is a vertical straight line parallel to the y axis at x = -1 ; its slope is infinite
hey,the graph of x=5 is a straight line parallel to Y-axis. all the points on the line have x-coordinate equal to 5. so on the X-axis just draw a perpendicular line 5 units away.
An horizontal line . A line parallel with the x-axis. NB A vertical line / a slope parallel with the y-axis is described as 'undefined'.
The slope is undefined.
[A Parallel line is a straight line, opposite to another, that do not intersect or meet.] Ie. Line 1 is Parallel to Line 2. ------------------------------------------------- <Line 1 ------------------------------------------------- <Line 2