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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)
Origin
The Cartesian plane has a point known as the Origin and all distances are measured from there. There are two lines through the origin which are called the x and y axes. The x-axis is a horizontal number line with the Origin at 0 and positive values to the right. The y-axis is a vertical number line with the Origin at 0 and positive values going up the page. The x coordinate of any point is found by drawing a line perpendicular to the x axis from the point. It meets the x axis at the x-coordinate. Similarly, a line perpendicular to the y axis from the point identifies the y-coordinate.