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The vertical line is known as the y axis. It is nothing more than a measuring stick to count how far up or down a point is from the horizontal line. The horizontal line, then, is known as the x axis and measures the distance left or right from the vertical line.
In the same way, the x-axis is also the line y = 0. Then, algebraically, 1  an x-intercept is a point on the graph where y is zero, and.  a y-intercept is a point on the graph where x is zero.