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if A(-1;10) B(0 ;-1) C (-3;2) ,determine whether AB is perpendicular to AC
Two lines are perpendicular if the product of their slope is - 1. The slope of line AB=(-1-10)/(0-(-1))=-11 and the slope of the line AC=(2-10)/(-3-(-1))=4. Since the product of their slope isn't - 1. They aren't perpendicular.
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