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On a graph, parallel equations will run forever and never touch, whereas, perpendicular equations will make a right angle with each other.

In an equation, parallel lines will have the same slope (the mx part of the equation).
Ex:


y = (1/3)x + 2
y = (1/3)x + 4


Perpendicular equations have negative reciprocal slopes of each other.
Ex:


y = (3/5)x + 6
y = -(5/3)x + 4

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Q: What is the difference between parallel and perpendicular equations?
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