Learn Before
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:
- Find the slope of the given line. If the equation is not already in slope-intercept form, rewrite it as to identify the slope .
- Use the same slope. Because parallel lines share the same slope, the new line also has slope .
- Identify the given point through which the new line must pass.
- Substitute into the point-slope form: .
- Simplify the equation into slope-intercept form if desired.
The key insight is that parallelism fixes the slope — the only unknown is the -intercept, which is determined by requiring the line to pass through the given point.
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Ch.4 Graphs - Elementary Algebra @ OpenStax
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Learn After
Finding the Equation of a Line Parallel to Through
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