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Perpendicular Lines

Two distinct lines found on the same plane are perpendicular lines if they intersect at right angles (90^\circ ). Moreover, the slopes of two perpendicular lines are opposite reciprocals of each other.

Another way to check if two lines are perpendicular is to multiply their slopes. If the product is -1, then the two lines are perpendicular.

the blue line with an equation of y = 2x+4 is perpendicular to the red line with an equation of y= (-x/2)+1

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