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# What is the definition of a "y-intercept?"

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### Quick Answer

The y-intercept is the point where a curve or a function intersects the y-axis. For a Cartesian plane, this refers to the point where x = 0.

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### Full Answer

Finding the y-intercept of a curve requires setting x = 0 in the equation and calculating the value for y. When a line is written in the slope-intercept form y = m*x + b, b is the y-intercept. For instance, the line y + 3*x - 10 = 0 is equivalently expressed as y = -3*x + 10. The y-intercept is 10. The x-intercept is the point where a curve or a function intersects the x-axis. This is the point where y = 0.

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