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# Plot multiple planes at once in Wolfram|Alpha

Posted 11 years ago
 Today I tried to plot a plane by using its coordinate form:plot 3x+3y-2z=18that worked pretty good and gave me the following result:http://www.wolframalpha.com/share/clip?f=d41d8cd98f00b204e9800998ecf8427enonbipn9a6However 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=3I only got an error. What is wrong with my syntax?Jan
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Posted 2 years ago
 You can plot two planes (but no more than two) in Wolfram|Alpha, by doing something like this:plot (3x+3y-2z-18)(x+3y-2z-5)=0Also try: plot (x+y+z-10)(x+y/10+z-5)=0
Posted 7 years ago
 Jan gave very good advice. For multiple planes in one graph, Show[graphics,options] would also be needed. E.g.: Show[ContourPlot3D[x == 2, {x, -5, 5}, {y, -5, 5}, {z, -5, 5}], ContourPlot3D[y == 3, {x, -5, 5}, {y, -5, 5}, {z, -5, 5}], ContourPlot3D[z == 4, {x, -5, 5}, {y, -5, 5}, {z, -5, 5}]] 
Posted 11 years ago
 In Mathematica, you would use the ContourPlot3D function for this http://reference.wolfram.com/mathematica/ref/ContourPlot3D.htmlIt 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 11 years 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