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Determining if Lines are Parallel from their Equations

To determine whether two lines are parallel given their linear equations, apply this verification process: first, rewrite each equation into slope-intercept form (y=mx+by = mx + b) to clearly identify their slopes and yy-intercepts. Next, compare these values. If the two lines share the exact same slope but possess different yy-intercepts, they are parallel. For the special case of vertical lines, which have undefined slopes and cannot be written in slope-intercept form, verify parallelism by confirming that their equations yield different xx-intercepts.

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Updated 2026-05-03

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Ch.3 Graphs and Functions - Intermediate Algebra @ OpenStax

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