- #1

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## Homework Statement

im having problems on how to sketch 3D functions, like z=4-x-y, any tips or website that gives a summary and useful techniques to graph functions like this?

- Thread starter Oomair
- Start date

- #1

- 36

- 0

im having problems on how to sketch 3D functions, like z=4-x-y, any tips or website that gives a summary and useful techniques to graph functions like this?

- #2

- 378

- 2

-make either x or y = 0 and then find how the thing looks in z-y or z-x plane

-find what happens when x--> inf y=0 or y--> inf , x =0 or y-->inf x -->inf

-Draw contours (should have learned them before getting into 3d)

- #3

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I agree with rootx. plotting the functions when x or y = 0 is a good tool.

- #4

- 1,752

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I still don't quite understand contours :(

- #5

- 378

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using k = 0,1,2.. works most times..

sometimes, using z-x and z-y plane

or, converting to rec/spherical co-ods

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