October 15, 2008

This resource has been contributed by Winpossible, and can also be accessed on their website by clicking here - Determine if two lines are perpendicular to each other.

In this mini-lesson you'll learn how to determine if two lines are perpendicular by looking at their equations. Perpendicular lines are lines that intersect at right angles and the product of their slopes is equal to –1. If two lines are represented by equations y_{1} = m_{1}x_{1} + c and y_{2} = m_{2}x_{2} + c, then m_{1} and m_{2} represent their slopes, and if the two lines are perpendicular then m_{1}m_{2} = –1. For example, 3y + 2x = 4 and 6x – 4y = –5 are perpendicular lines.

In this mini-lesson you'll learn how to determine if two lines are perpendicular by looking at their equations. Perpendicular lines are lines that intersect at right angles and the product of their slopes is equal to –1. If two lines are represented by equations y

This FREE mini-lesson is a part of Winpossible's online course that covers all topics within Algebra I. Click on the video below to go through it. If you like it, you can buy our online course in Algebra I by clicking here.

- Mathematics > General
- Mathematics > Algebra
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Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.