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Plot multiple planes at once in Wolfram|Alpha

GROUPS:
Today I tried to plot a plane by using its coordinate form:
plot 3x+3y-2z=18
that worked pretty good and gave me the following result:
http://www.wolframalpha.com/share/clip?f=d41d8cd98f00b204e9800998ecf8427enonbipn9a6

However I want to include another two planes into that surface plot by using:
plot 3x+3y-2z=18, 1x+3y-2z=5, 0x-6y+4z=3
I only got an error. What is wrong with my syntax?

Jan
POSTED BY: Jan Cieslik
Answer
10 months ago
In Mathematica, you would use the ContourPlot3D function for this http://reference.wolfram.com/mathematica/ref/ContourPlot3D.html

It may not be possible to create a 3D plot with multiple contours yet in Wolfram|Alpha, but I haven't been able to do it yet.
Wolfram|Alpha doesn't have a defined syntax, so there isn't anything generally wrong with your input.
POSTED BY: Sean Clarke
Answer
10 months ago
Thanks for your quick reply Sean.
It's a real pitty that Wolfram|Alpha does not support plotting multiple planes. So the only option left is to buy mathematica? ;)

With regards,

Jan
POSTED BY: Jan Cieslik
Answer
10 months ago