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- If two non-vertical lines that are in the same plane has the same slope, then they are said to be parallel. Two parallel lines won't ever intersect. If two non-vertical lines in the same plane intersect at a right angle then they are said to be perpendicular.
a vertical line is parallel to another vertical line. a vertical line is perpendicular to a horizontal line (and vice versa). Summary. parallel lines: same slope; perpendicular lines: negative reciprocal slope (−1/m)
- Slope
- −0.5
We can determine from their equations whether two lines are parallel by comparing their slopes. If the slopes are the same and the y -intercepts are different, the lines are parallel. If the slopes are different, the lines are not parallel. Unlike parallel lines, perpendicular lines do intersect.
Likewise, parallel lines become perpendicular when one line is rotated 90°. Parallel Curves. Curves can also be parallel when they keep the same distance apart (called "equidistant"), like railroad tracks. The red curve is parallel to the blue curve in both these cases:
Perpendicular lines are lines in the same plane that intersect at right angles (\(90\) degrees). Two nonvertical lines in the same plane, with slopes \(m_{1}\) and \(m_{2}\), are perpendicular if the product of their slopes is \(−1: m1⋅m2=−1\).
Write the equations of lines that are parallel or perpendicular to a given line. Parallel lines have the same slope and different y- intercepts. Lines that are parallel to each other will never intersect.
A pair of lines is perpendicular if the lines meet at \(90^\circ\) angle. Given two non-vertical lines in slope-intercept form \[ \begin{align} y &= m_1 x + b_1\\ y &= m_2 x + b_2, \end{align} \] the two lines are perpendicular if \(m_1 = - \frac{1}{m_2}\), that is, if the slopes are negative reciprocals of each other:
Parallel lines are those that never intersect and are always the same distance apart. Perpendicular lines are those that always intersect each other at right angles. Perpendicular lines are denoted by the symbol ⊥. The symbol || is used to represent parallel lines.
