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 June 19th, 2017, 11:06 AM #1 Senior Member     Joined: Nov 2015 From: United States of America Posts: 165 Thanks: 21 Math Focus: Calculus and Physics Can two different equations define the same plane in space? Hello all, I have been studying planes, and had a quick question that was on my mind. Can you have two different equations in the form of ax+by+cz=d that represent the same plane in space? For the equation of a plane we need a normal vector and a point on the plane. I suppose the normal vector for two equations that are representing the same plane, would have to be the same? However, the point could be different. Using a different point, would this impact the equation of the plane we are defining in space? After thought (after question more so), given a plane ax+by+cz=d, could you find a point on that plane given the equation that defines the plane? Essentially working backwards to find a point on the plane given the equation? Thanks, Jacob
 June 19th, 2017, 11:46 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,693 Thanks: 860 if you have $a x + b y + c z =d$ then $\gamma a x + \gamma b y + \gamma c z = \gamma d,~\forall \gamma \in \mathbb{R}$ represents the same plane. As far as finding a point on the plane simply choose values for $x,~y$ and then $\forall c \neq 0$ $z = \dfrac{d - a x - b y}{c}$ Thanks from 123qwerty and SenatorArmstrong
 June 21st, 2017, 11:33 AM #3 Senior Member   Joined: Oct 2013 From: New York, USA Posts: 580 Thanks: 80 Regardless of how many variables there are, an equation can be multiplied by an infinite amount of constants to produce an infinite amount of identical equations.

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