Activity (Process)

Finding an Equation of a Line Given the Slope and a Point

When the slope of a line and one point on it are known, the equation of the line can be determined using this four-step procedure: 1. Identify the slope mm. 2. Identify the point (x1,y1)(x_1, y_1). 3. Substitute the slope and the coordinates of the point into the point-slope form: yy1=m(xx1)y - y_1 = m(x - x_1). 4. Simplify and rewrite the equation in slope-intercept form y=mx+by = mx + b. This method works because the point-slope form is built from a known slope and any single point on the line, so plugging in the given information produces the unique equation of that line.

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Updated 2026-05-03

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