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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 -intercepts. If and denote the slopes of two parallel lines, then . Two lines with the same slope and the same -intercept are actually the same line, not two separate parallel lines. As a special case, parallel vertical lines have different -intercepts.
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