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Lake Tahoe Community College: Parmetric Equations

For Students 9th - 10th
Parmametric equations are explained by finding the parametric equation of a line giving two points on a line.
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Handout
University of California

Ucla Calculus Problem: Symmetric Equation of a Line

For Students 9th - 10th Standards
This site explains the steps to finding the parametric and symmetric equations of a line given two points in three dimensions.