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What are perpendicular lines and do these lines have a mathematical relationship that can be written as an equation?
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Perpendicular lines meet at right angle. Product of their gradients is always -1. For example line y=2x + 4 is perpendicular to line y= -x/2 . This is because 2 x -1/2 = -1.
by Diamond (44,680 points)
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Perpendicular line: A line is said to be perpendicular to another line if the two lines intersect at a right angle (90 degrees).

Perpendicular lines do have a mathematical relationship and can be written in an equation.

for example, they have undefined gradient form x = a, where "a" is the x-intercept.
by Wooden (762 points)

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