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Finding an Equation of a Line Parallel to a Given Line

To find the equation of a line that is parallel to a given line and passes through a specific point, use the following procedure:

  1. Find the slope of the given line. If the equation is not already in slope-intercept form, rewrite it as y=mx+by = mx + b to identify the slope mm.
  2. Use the same slope. Because parallel lines share the same slope, the new line also has slope mm.
  3. Identify the given point (x1,y1)(x_1, y_1) through which the new line must pass.
  4. Substitute into the point-slope form: yy1=m(xx1)y - y_1 = m(x - x_1).
  5. Simplify the equation into slope-intercept form y=mx+by = mx + b if desired.

The key insight is that parallelism fixes the slope — the only unknown is the yy-intercept, which is determined by requiring the line to pass through the given point.

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Updated 2026-05-03

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