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Definition

Y-Intercept of a Graph

A yy-intercept of a graph is the exact point where a curve or straight line intersects the vertical yy-axis. Since every position located squarely on the yy-axis features an xx-coordinate of zero, a yy-intercept always takes the ordered pair form (0,b)(0, b), where bb represents the specific yy-value at the intersection. To visually determine a yy-intercept on a coordinate plane, one must locate where the graphed line or curve touches the vertical axis. For example, if a graph crosses the yy-axis at y=3y = -3, its yy-intercept is identified as the point (0,3)(0, -3).

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Updated 2026-05-03

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