Determine if two lines are perpendicular to each other

Algebra I: Determine if two lines are perpendicular to each other

This is a free lesson from our course in Algebra I


	In this part of the 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 y₁ = m₁x₁ + c and y₂ = m₂x₂ + c, then m₁ and m₂ represent their slopes, and if the two lines are perpendicular then m₁m₂ = -1. For example, 3y + 2x = 4 and 6x - 4y = -5 are perpendicular lines. Few properties of perpendicular lines are : · two lines cross and all four angles are equal. · the adjacent angles total 180°.

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