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Also known as vertical intercept

thumb|300px|Graph y=f(x) with the x-axis as the horizontal axis and the y-axis as the vertical axis. The y-intercept of f(x) is indicated by the red dot at (x=0, y=1). In analytic geometry, using the common convention that the horizontal axis represents a variable x and the vertical axis represents a variable y, a y-intercept or vertical intercept is a point where the graph of a function or relation intersects the y-axis of the coordinate system.