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Slope-Intercept Form of an Equation of a Line

The slope-intercept form is a way of writing the equation of a line that directly displays the line's slope and y-intercept. For a line with slope mm and y-intercept at the point (0,b)(0, b), the equation is:

y=mx+by = mx + b

In this form, the coefficient of xx gives the slope (how steep the line is and in which direction it tilts), and the constant term bb gives the y-coordinate of the point where the line crosses the y-axis. Because both key features of the line are visible at a glance, the slope-intercept form is especially useful for graphing and for comparing lines.

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Updated 2026-05-03

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