Why is the plane x=2/5 crossing the y-axis instead of the x-axis? I thought it would be opposite like when you graph a line. Would the vector be (.4,0,0)
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Donna
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1But it crosses the $x$-axis, at $\left(\frac25,0,0\right)$ as it should. That axis is the red one. – José Carlos Santos Sep 19 '18 at 16:59
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On geogebra, it is telling me that the x-axis is the green one and the y-axis is the red one. That is why I am sooo confused. – Donna Sep 19 '18 at 17:00
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If x=2/5 then any point (2/5,s,t) is on the plane. it will never intersect the y- or z-axes, just like in 2d, the line x=2/5 never crosses the y-axis – David P Sep 19 '18 at 17:01
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Who is telling you that the $x$-axis is the red one? Create the point $(1,0,0)$ and you will see that it lies on the red axis, not on the green one. – José Carlos Santos Sep 19 '18 at 17:01
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1This page says "...the axes in their default colors of Red, Green, and Blue." – Weather Vane Sep 19 '18 at 17:06
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Thank you for clarifying. I thought I was going crazy. – Donna Sep 19 '18 at 17:11
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I'm not familiar with your software, but geometrically the plane $x=2/5$ should cross the $x$ axis, and only the $x$ axis, at the point $(2/5,0,0)$. The values of $y$ and $z$ can be anything, but the plane never crosses either the $y$ or $z$ axes, because that would require $x=0$.
John
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