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 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. Few properties of perpendicular lines are : · two lines cross and all four angles are equal. · the adjacent angles total 180°.
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