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{{ printedBook.courseTrack.name }} {{ printedBook.name }} Lines in a coordinate plane are said to be parallel if they never intersect. Non-vertical lines are parallel if and only if they have the same slope and different $y$-intercepts. Two lines written in slope-intercept form, $y=mx+b,$ are parallel under the following conditions.

$m_{1}=m_{2}andb_{1} =b_{2}$

Vertical lines are parallel if and only if they have different $x$-intercepts.