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°.
Other useful lessons:
 Determine if two lines are parallel to each other Find equation of a line parallel to the line Find equation of a line perpendicular to the line
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