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Definition

Parallel Lines

Two lines in a coordinate plane are parallel if they do not intersect — they never cross, no matter how far they are extended in either direction. For non-vertical lines, parallel lines share the same slope but have different yy-intercepts. If m1m_1 and m2m_2 denote the slopes of two parallel lines, then m1=m2m_1 = m_2. Two lines with the same slope and the same yy-intercept are actually the same line, not two separate parallel lines. As a special case, parallel vertical lines have different xx-intercepts.

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Updated 2026-05-06

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