How do I plot a 3 variables implicit function

Questions
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1

Hi, how do I plot this function x^2+y^2+z=9.
Here is t how it looks x^2+y^2+z=9 - Wolfram|Alpha

2

if you move the mouse pointer to the lower left of the 3d-plot you will see some icons, click on the A icon to get the Mathematica command for the plot.

3

thank you :smiley: