Teaching guide
How to Graph z=f(x,y) Online
Type a formula, choose x and y ranges, then rotate the result to inspect slices.
Use the interactive graph first, then connect the visual shape to the written rule.
Classroom check
Q: What is the first check after plotting?
A: Check whether the graph scale matches the expected domain.
Try it yourself
Use the interactive calculator below to experiment with this concept.
Related guides
Saddle vs Minimum
A saddle curves up in one direction and down in another, unlike a true minimum.
Surface and Contours
Contours are horizontal slices of the 3D graph projected into 2D.
Teacher Setup
Use a locked view and teacher mode, which hides the answer until you reveal it, for classroom embeds.
Export PNG
Use the export button after rotating the graph to the desired angle.