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- Two lines are perpendicular when they meet at a right angle (90°).
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How to use Algebra to find parallel and perpendicular lines. Parallel Lines. How do we know when two lines are parallel? Their slopes are the same! The slope is the value m in the equation of a line: y = mx + b. Example: Find the equation of the line that is: parallel to y = 2x + 1. and passes though the point (5,4) The slope of y = 2x + 1 is 2.
- 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:
Parallel lines have the same slope. Perpendicular lines have slopes that are opposite reciprocals. In other words, if \(m=\frac{a}{b}\), then \(m_{⊥}=−\frac{b}{a}\). To find an equation of a line, first use the given information to determine the slope. Then use the slope and a point on the line to find the equation using point-slope form.
Aug 24, 2022 · Parallel lines have the same slope; Perpendicular lines have negative reciprocal slopes; How to find an equation of a line parallel to a given line. Find the slope of the given line. Find the slope of the parallel line. Identify the point. Substitute the values into the point-slope form: \(y−y_1=m(x−x_1)\). Write the equation in slope ...
When two planes are perpendicular to the same line, they are parallel planes. When a plane intersects two parallel planes, the intersection is two parallel lines. Parallel and Perpendicular Lines Geometry Index. Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.
Table of Contents. Parallel and Perpendicular Lines. Slopes of Parallel and Perpendicular Lines. Parallel and Perpendicular Lines – Examples. Writing Equations of Parallel and Perpendicular Lines. Equation of a Line Perpendicular to a Given Line. Horizontal and Vertical Lines. Parallel Lines or the Same Line.
